Defn: The quality or state of being irrestible, irresistibleness.
IRRESISTIBLE Ir`re*sist"i*ble, a. Etym: [Pref. ir- not + resistible: cf. F. irrésistible.]
Defn: That can not be successfully resisted or opposed; superior toopposition; resistless; overpowering; as, an irresistible attraction.An irresistible law of our nature impels us to seek happiness. J. M.Mason.
IRRESISTIBLENESSIr`re*sist"i*ble*ness, n.
Defn: Quality of being irrestible.
IRRESISTIBLYIr`re*sist"i*bly, adv.
Defn: In an irrestible manner.
IRRESISTLESSIr`re*sist"less, a.
Defn: Irresistible. [Obs.] Glanvill.
IRRESOLUBLEIr*res"o*lu*ble, a. Etym: [L. irresolubilis: cf. F. irrésoluble. SeeResoluble, and cf. Irresolvable.]
1. Incapable of being dissolved or resolved into parts; insoluble. Boyle.
2. Incapable of being relieved or assisted. [Obs.] The second is in the irresoluble condition of our souls after a known sin committed. Bp. Hall.
IRRESOLUBLENESSIr*res"o*lu*ble*ness, n.
Defn: The state or quality of being irresoluble; insolubility.
IRRESOLUTEIr*res"o*lute, a. Etym: [Pref. ir- not + resolute: cf. F. irrésolu,L. irresolutus not loosened.]
Defn: Not resolute; not decided or determined; wavering; given to doubt or irresolution. Weak and irresolute is man. Cowper.
Syn.— Wavering; vacillating; undetermined; undecided; unsettled;fickle; changeable; inconstant.— Ir*res"o*lute*ly, adv.— Ir*res"o*lute*ness, n.
IRRESOLUTIONIr*res`o*lu"tion, n. Etym: [Cf. F. irrésolution.]
Defn: Want of resolution; want of decision in purpose; a fluctuation of mind, as in doubt, or between hope and fear; irresoluteness; indecision; vacillation. Irresolution on the schemes of life which offer themselves to our choice, and inconstancy in pursuing them, are the greatest causes of all unhappiness. Addison.
IRRESOLVABILITYIr`re*solv`a*bil"i*ty, n.
Defn: The quality of being irresolvable; irresolvableness.
IRRESOLVABLEIr`re*solv"a*ble, a. Etym: [Pref. ir- not + resolvable. Cf.Irresoluble.]
Defn: Incapable of being resolved; not separable into component parts. Irresolvable nebulæ (Astron.), nebulæ of a cloudlike appearance, which have not yet been resolved by the telescope into stars. Sir W. Herschel.
IRRESOLVABLENESSIr`re*solv"a*ble*ness, n.
Defn: The quality or state of being irresolvable; irresolvability.
IRRESOLVEDLYIr`re*solv"ed*ly, adv.
Defn: Without settled determination; in a hesitating manner; doubtfully. [R.]
IRRESPECTIVEIr`re*spec"tive, a.
1. Without regard for conditions, circumstances, or consequences; unbiased; independent; impartial; as, an irrespective judgment.
According to this doctrine, it must be resolved wholly into the absolute, irrespective will of God. Rogers.
2. Disrespectful. [Obs.] Sir C. Cornwallis. Irrespective of, regardless of; without regard to; as, irrespective of differences.
IRRESPECTIVELYIr`re*spec"tive*ly, adv.
Defn: Without regard to conditions; not making circumstances intoconsideration.Prosperity, considered absolutely and irrespectively, is better andmore desirable than adversity. South.
IRRESPIRABLEIr*res"pi*ra*ble, a. Etym: [L. irrespirabilis: cf. F. irrespirable.See Respirable.]
Defn: Unfit for respiration; not having the qualities necessary to support animal life; as, irrespirable air.
IRRESPONSIBILITYIr`re*spon`si*bil"i*ty, n. Etym: [Cf. F. irresponsabilité.]
Defn: Want of, or freedom from, responsibility or accountability.
IRRESPONSIBLE Ir`re*spon"si*ble, a. Etym: [Pref. ir- not + responsible: cf. F. irresponsable.]
1. Nor responsible; not liable or able to answer fro consequences; innocent.
2. Not to be trusted; unreliable.
IRRESPONSIBLYIr`re*spon"si*bly, adv.
Defn: So as not to be responsible.
IRRESPONSIVEIr`re*spon"sive, a.
Defn: Not responsive; not able, ready, or inclined to respond.
IRRESUSCITABLEIr`re*sus"ci*ta*ble, a.
Defn: Incapable of being resuscitated or revived.— Ir`re*sus"ci*ta*bly, adv.
IRRETENTIONIr`re*ten"tion, n.
Defn: Want of retaining power; forgetfulness. De Quincey.
IRRETENTIVEIr`re*ten"tive, a.
Defn: Not retentive; as, an irretentive memory.
IRRETRACEABLEIr`re*trace"a*ble, a.
Defn: Incapable of being retraced; not retraceable.
IRRETRACTILEIr`re*tract"ile, a.
1. Not retractile.
2. Not tractile or ductile. [R.] Sir W. Hamilton.
IRRETRIEVABLEIr`re*triev"a*ble, a.
Defn: Not retrievable; irrecoverable; irreparable; as, an irretrievable loss.
Syn.— Irremediable; incurable; irrecoverable.
IRRETRIEVABLENESSIr`re*triev"a*ble*ness, n.
Defn: The state or quality of being irretrievable.
IRRETRIEVABLYIr`re*triev"a*bly, adv.
Defn: In an irretrievable manner.
IRRETURNABLEIr`re*turn"a*ble, a.
Defn: Not to be returned.
IRREVEALABLEIr`re*veal"a*ble, a.
Defn: Incapable of being revealed.— Ir`re*veal"a*bly, adv.
IRREVERENCEIr*rev"er*ence, n. Etym: [L. irreverentia: cf. F. irrévérence.]
Defn: The state or quality of being irreverent; want of proper reverence; disregard of the authority and character of a superior.
IRREVERENDIr*rev"er*end, a.
Defn: Irreverent. [Obs.]Immodest speech, or irreverend gesture. Strype.
IRREVERENTIr*rev"er*ent, a. Etym: [L. irreverens, -entis: cf. F. irrévérent.See In- not, and Reverent.]
Defn: Not reverent; showing a want of reverence; expressive of a want of veneration; as, an irreverent babbler; an irreverent jest.
IRREVERENTLYIr*rev"er*ent*ly, adv.
Defn: In an irreverent manner.
IRREVERSIBILITYIr`re*vers`i*bil"i*ty, n.
Defn: The state or quality of being irreversible; irreversibleness.
IRREVERSIBLEIr`re*vers"i*ble, a.
1. Incapable of being reversed or turned about or back; incapable of being made to run backward; as, an irreversible engine.
2. Incapable of being reversed, recalled, repealed, or annulled; as, an irreversible sentence or decree. This rejection of the Jews, as it is not universal, so neither is it final and irreversible. Jortin.
Syn.— Irrevocable; irrepealable; unchangeable.
IRREVERSIBLENESSIr`re*vers"i*ble*ness, n.
Defn: The state or quality of being irreversible.
IRREVERSIBLE STEERING GEARIr`re*vers"i*ble steering gear. (Mach.)
Defn: A steering gear, esp. for an automobile, not affected by the road wheels, as when they strike an obstacle side ways, but easily controlled by the hand wheel or steering lever.
IRREVERSIBLYIr`re*vers"i*bly, adv.
Defn: In an irreversible manner.
IRREVOCABILITYIr*rev`o*ca*bil"i*ty, n. Etym: [Cf. F. irrévocabilité.]
Defn: The state or quality of being irrevocable; irrevocableness.
IRREVOCABLEIr*rev"o*ca*ble, a. Etym: [L. irrevocabilis: cf. F. irrévocable. SeeIn- not, and Revoke, and cf. Irrevocable.]
Defn: Incapable of being recalled or revoked; unchangeable;irreversible; unalterable; as, an irrevocable promise or decree;irrevocable fate.Firm and irrevocable is my doom. Shak.— Ir*rev"o*ca*ble*ness, n.— Ir*rev"o*ca*bly, adv.
IRREVOKABLEIr`re*vok"a*ble, a. Etym: [Pref. ir- not + revoke.]
Defn: Irrevocable. [R.]
IRREVOLUBLEIr*rev"o*lu*ble, a.
Defn: That has no finite period of revolution; not revolving. [R.]The dateless and irrevocable circle of eternity. Milton.
IRRHETORICALIr`rhe*tor"ic*al, a.
Defn: Not rethorical.
IRRIGATEIr"ri*gate, v. t. [imp. & p. p. Irrigated; p. pr. & vb. n.Irrigating.] Etym: [L. irrigatus, p. p. of irrigare to irrigate: ir-in + rigare to water; prob. akin to E. rain. See Rain.]
1. To water; to wet; to moisten with running or dropping water; to bedew.
2. (Agric.)
Defn: To water, as land, by causing a stream to flow upon, over, or through it, as in artificial channels.
IRRIGATIONIr`ri*ga"tion, n. Etym: [L. irrigatio: cf. F. irrigation.]
Defn: The act or process of irrigating, or the state of being irrigated; especially, the operation of causing water to flow over lands, for nourishing plants.
IRRIGUOUSIr*rig"u*ous, a. Etym: [L. irriguus. See Irrigate.]
1. Watered; watery; moist; dewy. [Obs.] The flowery lap Of some irriguous valley spreads her store. Milton.
2. Gently penetrating or pervading. [Obs.] J. Philips.
IRRISIBLEIr*ris"i*ble, a. Etym: [Pref. ir- not + risible. See Irrision.]
Defn: Not risible. [R.]
IRRISION Ir*ri"sion, n. Etym: [L. irrisio, fr. irridere, irrisum. to laugh at; pref. ir- in + ridere to laugh: cf. F. irrision.]
Defn: The act of laughing at another; derision.This being spoken scepticè, or by way of irrision. Chapman.
IRRITABILITYIr`ri*ta*bil"i*ty, n. Etym: [L. irritabilitas: cf. F. irritabilité.]
1. The state or quality of being irritable; quick excitability; petulance; fretfulness; as, irritability of temper.
2. (Physiol.)
Defn: A natural susceptibility, characteristic of all living organisms, tissues, and cells, to the influence of certain stimuli, response being manifested in a variety of ways, — as that quality in plants by which they exhibit motion under suitable stimulation; esp., the property which living muscle processes, of responding either to a direct stimulus of its substance, or to the stimulating influence of its nerve fibers, the response being indicated by a change of form, or contraction; contractility.
3. (Med.)
Defn: A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli. See Irritation, n., 3.
IRRITABLEIr"ri*ta*ble, a. Etym: [L. irritabilis: cf. F. irritable. SeeIrritate.]
1. Capable of being irriated.
2. Very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper. Vicious, old, and irritable. Tennyson.
3. (Physiol.)
Defn: Endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli.
4. (Med.)
Defn: Susceptible of irritation; unduly sensitive to irritants or stimuli. See Irritation, n., 3.
Syn.— Excitable; irascible; touchy; fretful; peevish.
IRRITABLENESSIr"ri*ta*ble*ness, n.
Defn: Irritability.
IRRITABLYIr"ri*ta*bly, adv.
Defn: In an irritable manner.
IRRITANCYIr"ri*tan*cy, n. Etym: [From 1st Irritant.] (Scots Law)
Defn: The state or quality of being null and void; invalidity; forfeiture. Burrill.
IRRITANCYIr"ri*tan*cy, n. Etym: [From 2d Irritant.]
Defn: The state o quality of being irritant or irritating.
IRRITANTIr"ri*tant, a. Etym: [LL. irritants, -antis, p. pr. of irritare tomake null, fr. L. irritus void; pref. ir- not + ratus established.](Scots Law)
Defn: Rendering null and void; conditionally invalidating. The states elected Harry, Duke of Anjou, for their king, with this clause irritant; that, if he did violate any part of his oath, the people should owe him no allegiance. Hayward.
IRRITANT Ir"ri*tant, a. Etym: [L. irritans, -antis, p. pr. of irritare: cf. F. irritant. See Irritate to excite.]
Defn: Irritating; producing irritation or inflammation.
IRRITANTIr"ri*tant, n. Etym: [Cf. F. irritant.]
1. That which irritates or excites.
2. (Physiol. & Med.)
Defn: Any agent by which irritation is produced; as, a chemical irritant; a mechanical or electrical irritant.
3. (Toxicology)
Defn: A poison that produces inflammation. Counter irritant. Seeunder Counter.— Pure irritant (Toxicology), a poison that produces inflammationwithout any corrosive action upon the tissues.
IRRITATEIr"ri*tate, v. t. Etym: [See 1 st Irritant.]
Defn: To render null and void. [R.] Abp. Bramhall.
IRRITATEIr"ri*tate, v. t. [imp. & p. p. Irritated; p. pr. & vb. n.Irritating.] Etym: [L. irritatus, p. p. of irritare. Of doubtfulorigin.]
1. To increase the action or violence of; to heighten excitement in; to intensify; to stimulate. Cold maketh the spirits vigorous and irritateth them. Bacon.
2. To excite anger or displeasure in; to provoke; to tease; to exasperate; to annoy; to vex; as, the insolence of a tyrant irritates his subjects. Dismiss the man, nor irritate the god: Prevent the rage of him who reigns above. Pope.
3. (Physiol.)
Defn: To produce irritation in; to stimulate; to cause to contract.See Irritation, n., 2.
4. (Med.)
Defn: To make morbidly excitable, or oversensitive; to fret; as, the skin is irritated by friction; to irritate a wound by a coarse bandage.
Syn. — To fret; inflame; excite; provoke; tease; vex; exasperate; anger; incense; enrage. — To Irritate, Provoke, Exasperate. These words express different stages of excited or angry feeling. Irritate denotes an excitement of quick and slightly angry feeling which is only momentary; as, irritated by a hasty remark. To provoke implies the awakening of some open expression of decided anger; as, a provoking insult. Exasperate denotes a provoking of anger at something unendurable. Whatever comes across our feelings irritates; whatever excites anger provokes; whatever raises anger to a high point exasperates. "Susceptible and nervous people are most easily irritated; proud people are quickly provoked; hot and fiery people are soonest exasperated." Crabb.
IRRITATEIr"ri*tate, a.
Defn: Excited; heightened. [Obs.]
IRRITATIONIr`ri*ta"tion, n. Etym: [L. irritatio: cf. F. irritation.]
1. The act of irritating, or exciting, or the state of being irritated; excitement; stimulation, usually of an undue and uncomfortable kind; especially, excitement of anger or passion; provocation; annoyance; anger. The whole body of the arts and sciences composes one vast machinery for the irritation and development of the human intellect. De Quincey.
2. (Physiol.)
Defn: The act of exciting, or the condition of being excited to action, by stimulation; — as, the condition of an organ of sense, when its nerve is affected by some external body; esp., the act of exciting muscle fibers to contraction, by artificial stimulation; as, the irritation of a motor nerve by electricity; also, the condition of a muscle and nerve, under such stimulation.
3. (Med.)
Defn: A condition of morbid excitability or oversensitiveness of an organ or part of the body; a state in which the application of ordinary stimuli produces pain or excessive or vitiated action.
IRRITATIVEIr"ri*ta*tive, a.
1. Serving to excite or irritate; irritating; as, an irritative agent.
2. Accompanied with, or produced by, increased action or irritation; as, an irritative fever. E. Darwin.
IRRITATORYIr"ri*ta*to*ry, a.
Defn: Exciting; producing irritation; irritating. [R.] Hales.
IRRORATEIr"ro*rate, v. t. [imp. & p. p. Irrorated; p. pr. & vb. n.Irrorating.] Etym: [L. irroratus, p. p. of irrorare to bedew; pref.ir- in + ros, roris, dew.]
Defn: To sprinkle or moisten with dew; to bedew. [Obs.]
IRRORATEIr"ro*rate, a. (Zoöl.)
Defn: Covered with minute grains, appearing like fine sand.
IRRORATIONIr`ro*ra"tion, n. Etym: [Cf. F. irroration.]
Defn: The act of bedewing; the state of being moistened with de[Obs.] Chambers.
IRROTATIONALIr`ro*ta"tion*al, a. (Physics)
Defn: Not rotatory; passing from one point to another by a movement other than rotation; — said of the movement of parts of a liquid or yielding mass. Sir W. Thomson.
IRRUBRICALIr*ru"bric*al, a.
Defn: Contrary to the rubric; not rubrical.
IRRUGATEIr"ru*gate, v. t. Etym: [L. irrugatus, p. p. of irrugare to wrinkle.]
Defn: To wrinkle. [Obs.]
IRRUPTED Ir*rupt"ed, a. Etym: [L. irruptus, p. p. of irrumpere to break in; pref. ir- in + rumpere to break or burst. See Rupture.]
Defn: Broken with violence.
IRRUPTIONIr*rup"tion, n. Etym: [L. irruptio: cf. F. irruption. See Irrupted.]
1. A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea. Lest evil tidings, with too rude irruption Hitting thy aged ear, should pierce too deep. Milton.
2. A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy. Addison.
Syn.— Invasion; incursion; inroad. See Invasion.
IRRUPTIVEIr*rup"tive, a.
Defn: Rushing in or upon.
IRVINGITEIr"ving*ite, n. (Eccl.)
Defn: The common designation of one a sect founded by the Rev. Edward Irving (about 1830), who call themselves the Catholic Apostolic Church. They are highly ritualistic in worship, have an elaborate hierarchy of apostles, prophets, etc., and look for the speedy coming of Christ.
IS-Is-
Defn: . See Iso-.
ISIs, v. i. Etym: [AS. is; akin to G. & Goth. ist, L. est, Gr. asti. .Cf. Am, Entity, Essence, Absent.]
Defn: The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See Be.
Note: In some varieties of the Northern dialect of Old English, iswas used for all persons of the singular.For thy is I come, and eke Alain. Chaucer.Aye is thou merry. Chaucer.
Note: The idiom of using the present for future events sure to happen is a relic of Old English in which the present and future had the same form; as, this year Christmas is on Friday. To-morrow is the new moon. 1 Sam. xx. 5.
ISABEL; ISABEL COLORIs"a*bel, n., Is"a*bel col"or.Etym: [F. isabelle.]
Defn: See Isabella.
ISABELLA; ISABELLA COLOR Is`a*bel"la, n., Is`a*bel"la col"or. Etym: [Said to be named from the Spanish princess Isabella, daughter of king Philip II., in allusion to the color assumed by her shift, which she wore without change from 1601 to 1604, in consequence of a vow made by her.]
Defn: A brownish yellow color.
ISABELLA GRAPEIs`a*bel"la grape`. (Bot.)
Defn: A favorite sweet American grape of a purple color. See Fox grape, under Fox.
ISABELLA MOTHIs`a*bel"la moth`. (Zoöl.)
Defn: A common American moth (Pyrrharctia isabella), of an isabella color. The larva, called woolly bear and hedgehog caterpillar, is densely covered with hairs, which are black at each end of the body, and red in the middle part.
ISABELLINEIs`a*bel"line, a.
Defn: Of an isabel or isabella color.
ISAGELOUS; ISAGELA. [Is- + Gr. Agelos Information.]
Defn: Containing the same information, as isagelous sentences. The coded message and the original, though appearing entirely unlike, are completely isagelous. Bacon The complementary strands have isagelous sequences. J. D. Watson. — Isagel I*sag"e*lous (i*sâg"ê*lûs), a. Etym: [Is- + Gr. a`gelos information.]
Defn: Containing the same information, as isagelous sentences. "The coded message and the original, though appearing entirely unlike, are completely isagelous." Bacon "The complementary strands have isagelous sequences." J. D. Watson. — Is"a*gel n.
Defn: One of two or more objects containing the same information.
ISAGOGEI"sa*goge, n. Etym: [L., fr. Fr.
Defn: An introduction. [Obs.] Harris.
ISAGOGIC; ISAGOGICALI"sa*gog"ic, I"sa*gog"ic*al, a. Etym: [L. isagogicus, Gr.
Defn: Introductory; especially, introductory to the study of theology.
ISAGOGICSI"sa*gog"ics, n. (Theol.)
Defn: That part of theological science directly preliminary to actual exegesis, or interpretation of the Scriptures.
ISAGONI"sa*gon, n. Etym: [Gr. isagone, a.] (Math.)
Defn: A figure or polygon whose angles are equal.
ISAPOSTOLICIs*ap`os*tol"ic, a. Etym: [Gr.
Defn: Having equal, or almost equal, authority with the apostles of their teachings.
ISATIC; ISATINICI*sat"ic, I`sa*tin"ic, a. (Chem.)
Defn: Pertaining to, or derived from, isatin; as, isatic acid, which is also called trioxindol.
ISATIDEI"sa*tide, n. (Chem.)
Defn: A white crystalline substance obtained by the partial reduction of isatin. [Written also isatyde.]
ISATINI"sa*tin, n. Etym: [See Isatis.] (Chem.)
Defn: An orange-red crystalline substance, C8H5NO2, obtained by the oxidation of indigo blue. It is also produced from certain derivatives of benzoic acid, and is one important source of artificial indigo. [Written also, less properly, isatine.]
ISATISI"sa*tis, n. Etym: [L., a kind of plant, Gr. (Bot.)
Defn: A genus of herbs, some species of which, especially the Isatis tinctoria, yield a blue dye similar to indigo; woad.
ISATOGENI*sat"o*gen, n. Etym: [Isatin + -gen.] (Chem.)
Defn: A complex nitrogenous radical, C8H4NO2, regarded as the essential residue of a series of compounds, related to isatin, which easily pass by reduction to indigo blue. — I*sat`o*gen"ic, a.
ISATROPICI`sa*trop"ic, a. Etym: [Is- + atropine.] (Chem.)
Defn: Pertaining to, or designating, an acid obtained from atropine, and isomeric with cinnamic acid.
ISCHIACIs"chi*ac, a. (Anat.)
Defn: See Ischial.
ISCHIADICIs`chi*ad"ic, a. Etym: [L. ischiadicus, Gr. Sciatic.] (Anat.)
Defn: Ischial. [R.] Ischiadic passion or disease (Med.), a rheumatic or neuralgic affection of some part about the hip joint; — called also sciatica.
ISCHIALIs"chi*al, a. (Anat.)
Defn: Of or pertaining to the ischium or hip; ischiac; ischiadic; ischiatic. Ischial callosity (Zoöl.), one of the patches of thickened hairless, and often bright-colored skin, on the buttocks of many apes, as the drill.
ISCHIATICIs`chi*at"ic, a. (Anat.)
Defn: Same as Ishial.
ISCHIOCAPSULARIs`chi*o*cap"su*lar a. Etym: [Ischium + capsular.] (Anat.)
Defn: Of or pertaining to the ischium and the capsule of the hip joint; as, the ischiocapsular ligament.
ISCHIOCERITEIs`chi*o*ce"rite, n. Etym: [Gr. (Zoöl.)
Defn: The third joint or the antennæ of the Crustacea.
ISCHION; ISCHIUMIs"chi*on, Is"chi*um, n. Etym: [L., Gr.
1. (Anat.)
Defn: The ventral and posterior of the three principal bones composing either half of the pelvis; seat bone; the huckle bone.
2. (Zoöl.)
Defn: One of the pleuræ of insects.
ISCHIOPODITEIs`chi*op"o*dite, n. Etym: [Gr. (Zoöl.)
Defn: The third joint of the typical appendages of Crustacea.
ISCHIORECTALIs`chi*o*rec"tal, a. Etym: [Ischium + rectal.] (Anat.)
Defn: Of or pertaining to the region between the rectum and ishial tuberosity.
ISCHURETICIs`chu*ret"ic, a.
Defn: Having the quality of relieving ischury.— n.
Defn: An ischuretic medicine.
ISCHURYIs"chu*ry, n. Etym: [L. ischuria, Gr. ischurie.] (Med.)
Defn: A retention or suppression of urine.
-ISE -ise
Defn: . See -ize.
ISENTROPICI`sen*trop"ic, a. Etym: [Is- + entropy + -ic.] (Physics)
Defn: Having equal entropy. Isentropic lines, lines which pass through points having equal entropy.
ISETHIONICI*seth`i*on"ic, a. Etym: [Is- + ethionic.] (Chem.)
Defn: Pertaining to, derived from, or designating, an acid, HO.C2H4.SO3H, obtained as an oily or crystalline substance, by the action of sulphur trioxide on alcohol or ether. It is derivative of sulphuric acid.
-ISH -ish. Etym: [AS. -isc; akin to G. -isch, OHG. -isc, Goth. & Dan. - isk, Gr. -esque.]
Defn: A suffix used to from adjectives from nouns and from adjectives. It denotes relation, resemblance, similarity, and sometimes has a diminutive force; as, selfish, boyish, brutish; whitish, somewhat white.
-ISH -ish. Etym: [OE. -issen, fr. F. -is, -iss- (found in the present particle, etc., of certain verbs, as finir to finish, fleurir to flourish), corresponding to L. -escere, an inchoative ending.]
Defn: A verb ending, originally appearing in certain verbs of French origin; as, abolish, cherish, finish, furnish, garnish, impoverish.
ISHMAELITEIsh"ma*el*ite, n.
1. A descendant of Ishmael (the son of Abraham and Hagar), of whom it was said, "His hand will be against every man, and every man's hand against him." Gen. xvi. 12.
2. One at enmity with society; a wanderer; a vagabond; an outcast. Thackeray.
3. See Ismaelian.
ISHMAELITISHIsh"ma*el*i`tish, a.
Defn: Of, pertaining to, or resembling, an Ishmaelite or theIshmaelites.
ISIACI"si*ac, a. Etym: [L. Isiacus, Gr.
Defn: Pertaining to the goddess Isis; as, Isiac mysteries.
ISICLEI"si*cle, n.
Defn: A icicle. [Obs.]
ISIDORIANIs`i*do"ri*an, a.
Defn: Pertaining, or ascribed, to Isidore; as, the Isidorian decretals, a spurious collection of decretals published in the ninth century.
ISINGLASS I"sin*glass, n. Etym: [Prob. corrupted fr. D. huizenblas (akin to G. hausenblase), lit., bladder of the huso, or large sturgeon; huizen sturgeon + blas bladder. Cf. Bladder, Blast a gust of wind.]
1. A semitransparent, whitish, and very pure from of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the of Western Russia. It used for making jellies, as a clarifier, etc. Cheaper forms of gelatin are not unfrequently so called. Called also fish glue.
2. (Min.)
Defn: A popular name for mica, especially when in thin sheets.
ISISI"sis, n. Etym: [L., the goddess Isis, fr. Gr.
1. (Myth.)
Defn: The principal goddess worshiped by the Egyptians. She was regarded as the mother of Horus, and the sister and wife of Osiris. The Egyptians adored her as the goddess of fecundity, and as the great benefactress of their country, who instructed their ancestors in the art of agriculture.
2. (Zoöl.)
Defn: Any coral of the genus Isis, or family Isidæ, composed of joints of white, stony coral, alternating with flexible, horny joints. See Gorgoniacea.
3. (Astron.)
Defn: One of the asteroids.
ISLAMIs"lam, n. Etym: [Ar. islam obedience to the will of God, submission,humbling one's self, resigning one's self to the divine disposal. Cf.Moslem.]
1. The religion of the Mohammedans; Mohammedanism; Islamism. Their formula of faith is: There is no God but Allah, and Mohammed is his prophet.
2. The whole body of Mohammedans, or the countries which they occupy.
ISLAMISMIs"lam*ism, n. Etym: [Cf. F. islamisme.]
Defn: The faith, doctrines, or religious system of the Mohammedans;Mohammedanism; Islam.
ISLAMITEIs"lam*ite, n.
Defn: A Mohammedan.
ISLAMITICIs`lam*it"ic, a.
Defn: Of or pertaining to Islam; Mohammedan.
ISLAMIZEIs"lam*ize, v. i. & t. [imp. & p. p. Islamized; p. pr. & vb. n.Islamizing.]
Defn: To conform, or cause to conform, to the religion of Islam.
ISLAND Is"land, n. Etym: [OE. iland, yland, AS. igland, , ; ig, , island + land, lond, land. AS. ig, , is akin to AS. eá water, river, OHG. , G. au meadow, Icel. ey island, Dan. & Sw. ö, Goth. ahwa a stream, water, L. aqua water. The s is due to confusion with isle. Cf. Ait, Eyot, Ewer, Aquatic.]
1. A tract of land surrounded by water, and smaller than a continent. Cf. Continent.
2. Anything regarded as resembling an island; as, an island of ice.
3. (Zoöl.)
Defn: See Isle, n., 2. Islands of the blessed (Myth.), islands supposed to lie in the Western Ocean, where the favorites of the gods are conveyed at death, and dwell in everlasting joy.
ISLANDIs"land, v. t.
1. To cause to become or to resemble an island; to make an island or islands of; to isle. Shelley.
2. To furnish with an island or with islands; as, to island the deep. Southey.
ISLANDERIs"land*er, n.
Defn: An inhabitant of an island.
ISLANDYIs"land*y, a.
Defn: Of or pertaining to islands; full of islands. Cotgrave.
ISLEIsle, n. Etym: [Obs.]
Defn: See Aisle.
ISLEIsle, n. Etym: [OF. isle, F. île, L. insula; cf. Lith. sala. Cf.Insulate.]
1. An island. [Poetic] Imperial rule of all the seagirt isles. Milton.
2. (Zoöl.)
Defn: A spot within another of a different color, as upon the wings of some insects.
ISLEIsle, v. t.
Defn: To cause to become an island, or like an island; to surround or encompass; to island. [Poetic] Isled in sudden seas of light. Tennyson.
ISLETIs"let, n. Etym: [OF. islette (cf. F. îlot), dim. of isle.]
Defn: A little island.
-ISM -ism. Etym: [F. -isme, or L. -ismus, Gr.
Defn: A suffix indicating an act, a process, the result of an act or a process, a state; also, a characteristic (as a theory, doctrine, idiom, etc.); as, baptism, galvanism, organism, hypnotism, socialism, sensualism, Anglicism.
ISMIsm, n. Etym: [See ism, above.]
Defn: A doctrine or theory; especially, a wild or visionary theory.E. Everett.The world grew light-headed, and forth came a spawn of isms which noman can number. S. G. Goodrich.
ISMAELIAN; ISMAELITEIs`ma*e"li*an, Is"ma*el*ite, n. (Eccl.)
Defn: One of a sect of Mohammedans who favored the pretensions of the family of Mohammed ben Ismael, of the house Ali.
ISO-; IS-I"so-, Is-.Etym: [Gr. 'i`sos equal.]
Defn: A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.: (a) (Chem.) Applied to certain compounds having the same composition but different properties; as in isocyanic. (b) (Organic Chem.) Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; — contrasted with neo- and normal; as in isoparaffine; isopentane.
ISOBARI"so*bar, n. Etym: [Iso- + Gr. (Phys. Geog.)
Defn: A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line. [Written also isobare.]
ISOBARI"so*bar, n.
Defn: The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.
ISOBARICI`so*bar"ic, a. (Phys. Geog.)
Defn: Denoting equal pressure; as, an isobaric line; specifically, of or pertaining to isobars.
ISOBARISMI"so*bar*ism, n.
Defn: The quality or state of being equal in weight, especially in atmospheric pressure. Also, the theory, method, or application of isobaric science.
ISOBAROMETRICI`so*bar`o*met"ric, a. Etym: [Iso + barometric.] (Phys. Geog.)
Defn: Indicating equal barometric pressure.
ISOBATHYTHERMI`so*bath"y*therm, n. Etym: [Iso- + Gr. (Phys. Geog.)
Defn: A line connecting the points on the surface of the earth where a certain temperature is found at the same depth.
ISOBATHYTHERMICI`so*bath"y*ther"mic, a.
Defn: Of or pertaining to an isobathytherm; possessing or indicating the same temperature at the same depth.
ISOBRONTI"so*bront (i"so*bront), n. [Iso- + Gr. bronth` thunder.] (Meteor.)
Defn: An imaginary line, or a line on a chart, marking the simultaneous development of a thunderstorm, as noted by observing the time when the thunder is heard at different places.
ISOCEPHALISMI`so*ceph"a*lism, n. Etym: [From Gr. Iso-, and Cephalon.] (Art)
Defn: A peculiarity in the design of bas-relief by which the heads of human figures are kept at the same height from the ground, whether the personages are seated, standing, or mounted on horseback; — called also isokephaleia.
ISOCHASMI"so*chasm, n. Etym: [Iso- + chasm.] (Phys. Geog.)
Defn: A line connecting places on the earth's surface at which there is the same mean frequency of auroras.
ISOCHASMICI`so*chas"mic, a.
Defn: Indicating equal auroral display; as, an isochasmic line.
ISOCHEIMI"so*cheim, n. Etym: [Iso- + Gr. (Phys. Geog.)
Defn: A line connecting places on the earth having the same mean winter temperature. Cf. Isothere.
ISOCHEIMAL; ISOCHIMALI`so*chei"mal, I`so*chi"mal, a.
Defn: Pertaining to, having the nature of, or making, isocheims; as, an isocheimal line; an isocheimal chart.
ISOCHEIMENAL; ISOCHIMENALI`so*chei"me*nal, I`so*chi"me*nal a.
Defn: The same as Isocheimal.
ISOCHEIMICI`so*chei"mic, a.
Defn: The same as Isocheimal.
ISOCHIMENEI`so*chi"mene, n.
Defn: The same as Isocheim.
ISOCHORI"so*chor, n. [Iso- + Gr. xhw`ra space.] (Physics)
Defn: A line upon a thermodynamic diagram so drawn as to represent the pressures corresponding to changes of temperature when the volume of the gas operated on is constant. — I`so*chor"ic (#), a.
ISOCHROMATICI`so*chro*mat"ic, a. Etym: [Iso- + chromatic.] (Opt.)
Defn: Having the same color; connecting parts having the same color, as lines drawn through certain points in experiments on the chromatic effects of polarized light in crystals.
ISOCHRONALI*soch"ro*nal, a. Etym: [See Isochronous.]
Defn: Uniform in time; of equal time; performed in equal times; recurring at regular intervals; isochronal vibrations or oscillations.
ISOCHRONICI`so*chron"ic, a.
Defn: Isochronal.
ISOCHRONISMI*soch"ro*nism, n.
Defn: The state or quality of being isochronous.
ISOCHRONIZE I*soch"ro*nize, v. t. [imp. & p. p. -nized; p. pr. & vb. n. - nizing.] [See Isochronous.]
Defn: To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in frequency of vibration.
ISOCHRONONI*soch"ro*non, n. Etym: [NL. See Isochronous.]
Defn: A clock that is designed to keep very accurate time.
ISOCHRONOUSI*soch"ro*nous, a. Etym: [Gr.
Defn: Same as Isochronal.
ISOCHROOUSI*soch"ro*ous, a. Etym: [Iso- + Gr.
Defn: Having the same tint or color throughout; uniformly or evenly colored.
ISOCLINAL; ISOCLINICI`so*cli"nal, I`so*clin"ic, a. Etym: [Iso- + Gr.
Defn: Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip. Isoclinal lines (Magnetism), lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.
ISOCRYMALI`so*cry"mal, a. (Phys. Geog.)
Defn: Pertaining to, having the nature of, or illustrating, an isocryme; as, an isocrymal line; an isocrymal chart.
ISOCRYMEI"so*cryme, n. Etym: [Iso- + Gr. (Phys. Geog.)
Defn: A line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.
ISOCRYMICI`so*crym"ic, a.
Defn: Isocrymal.
ISOCYANICI`so*cy*an"ic, a. Etym: [Iso- + cyanic.] (Chem.)
Defn: Designating an acid isomeric with cyanic acid. Isocyanic acid, an acid metameric with cyanic acid, and resembling it in its salts. It is obtained as a colorless, mobile, unstable liquid by the heating cyanuric acid. Called technically carbimide.
ISOCYANURICI`so*cy`a*nu"ric, a. Etym: [Iso- + cyanuric.] (Chem.)
Defn: Designating, or pertaining to, an acid isomeric with cyanuric acid, and called also fulminuric acid. See under Fulminuric.
ISODIABATICI`so*di`a*bat"ic, a. Etym: [Iso- + Gr. (Physics)
Defn: Pertaining to the reception or the giving out of equal quantities of heat by a substance. Rankine. Isodiabatic lines or curves, a pair of lines or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat given out by the fluid during any given stage of the one process is equal to the quantity received during the corresponding stage of the other. Such lines are said to be isodiabatic with respect to each other. Compare Adiabatic.
ISODIAMETRICI`so*di`a*met"ric, a. Etym: [Iso- + diametric.]
1. (Crystallog.)
Defn: Developed alike in the directions of the several lateral axes; — said of crystals of both the tetragonal and hexagonal systems.
2. (Bot.)
Defn: Having the several diameters nearly equal; — said of the cells of ordinary parenchyma.
ISODIMORPHICI`so*di*mor"phic, a. Etym: [Iso- + dimorphic.]
Defn: Isodimorphous.
ISODIMORPHISMI`so*di*mor"phism, n.
Defn: Isomorphism between the two forms severally of two dimorphous substances.
ISODIMORPHOUSI`so*di*mor"phous, a. Etym: [Iso- + dimorphous.]
Defn: Having the quality of isodimorphism.
ISODROMEI"so*drome, n. [Iso- + Gr. course.] (Nav.)
Defn: A method of moving a fleet from one formation to another, the direction usually being changed eight points (90º), by means of paths of equal length for each ship. It is prohibited in the United States navy.
ISODULCITEI`so*dul"cite, n. Etym: [Iso- + dulcite.] (Chem.)
Defn: A white, crystalline, sugarlike substance, obtained by the decomposition of certain glucosides, and intermediate in nature between the hexacid alcohols (ductile, mannite, etc.) and the glucoses.
ISODYNAMICI`so*dy*nam"ic, a. Etym: [Iso- + dynamic.]
Defn: Of, pertaining to, having, or denoting, equality of force.Isodynamic foods (Physiol.), those foods that produce a similaramount of heat.— Isodynamic lines (Magnetism), lines on the earth's surfaceconnecting places at which the magnetic intensity is the same.
ISODYNAMOUSI`so*dy"na*mous, a. Etym: [Gr. Isodynamic.]
Defn: Of equal force or size.
ISOGEOTHERMI`so*ge"o*therm, n. Etym: [Iso- + Gr. gh^ the earth + qe`rmh heat.](Phys. Geog.)
Defn: A line or curved surface passing beneath the earth's surface through points having the same mean temperature.
ISOGEOTHERMAL; ISOGEOTHERMICI`so*ge`o*ther"mal, I`so*ge`o*ther"mic, a.
Defn: Pertaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. — n.
Defn: An isogeotherm.
ISOGONICI`so*gon"ic, a. Etym: [Iso- + Gr.
Defn: Pertaining to, or noting, equal angles. Isogonic lines (Magnetism), lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.
ISOGONICI`so*gon"ic, a. (Zoöl.)
Defn: Characterized by isogonism.
ISOGONISMI*sog"o*nism, n. Etym: [Iso- + Gr. (Zoöl.)
Defn: The quality of having similar sexual zooids or gonophores and dissimilar hydrants; — said of certain hydroids.
ISOGRAPHICI`so*graph"ic, a.
Defn: Of or pertaining to isography.
ISOGRAPHYI*sog"ra*phy, n. Etym: [Iso- + -graphy.]
Defn: Imitation of another's handwriting,
ISOHYETOSEI`so*hy"e*tose`, a. Etym: [Iso- + Gr. "yeto`s rain.] (Phys. Geog.)
Defn: Of or pertaining to lines connecting places on the earth's surface which have a mean annual rainfall. — n.
Defn: An isohyetose line.
ISOLABLEI"so*la*ble, a. Etym: [See Isolate.] (Chem.)
Defn: Capable of being isolated, or of being obtained in a pure state; as, gold is isolable.
ISOLATEI"so*late, v. t. [imp. & p. p. Isolated; p. pr. & vb. n. Isolating.]Etym: [It. isolato, p. p. of isolare to isolate, fr. isola island, L.insula. See 2d Isle, and cf. Insulate.]
1. To place in a detached situation; to place by itself or alone; to insulate; to separate from others. Short isolated sentences were the mode in which ancient wisdom delighted to convey its precepts. Bp. Warburton.
2. (Elec.)
Defn: To insulate. See Insulate.
3. (Chem.)
Defn: To separate from all foreign substances; to make pure; to obtain in a free state.
ISOLATEDI"so*la`ted, a.
Defn: Placed or standing alone; detached; separated from others.Isolated point of a curve. (Geom.) See Acnode.
ISOLATEDLYI"so*la`ted*ly, adv.
Defn: In an isolated manner.
ISOLATIONI`so*la"tion, n. Etym: [Cf. F. isolation.]
Defn: The act of isolating, or the state of being isolated; insulation; separation; loneliness. Milman.
ISOLATORI"so*la`tor, n.
Defn: One who, or that which, isolates.
ISOLOGOUSI*sol"o*gous, a. Etym: [Iso- + Gr. (Chem.)
Defn: Having similar proportions, similar relations, or similar differences of composition; — said specifically of groups or series which differ by a constant difference; as, ethane, ethylene, an acetylene, or their analogous compounds, form an isologous series.
ISOMERI"so*mer, n. Etym: [See Isomeric.] (Chem.)
Defn: A body or compound which is isomeric with another body or compound; a member of an isomeric series.
ISOMEREI"so*mere, n. [Iso- + -mere.] (Zoöl.)
1. A homologous or corresponding part or segment.
2. (Chem.) = Isomer.
ISOMERICI`so*mer"ic, a. Etym: [Iso- + Gr. isomérique.] (Chem.)
Defn: Having the same percentage composition; — said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif.: (a) Polymeric; i. e., having the same elements united in the same proportion by weight, but with different molecular weights; as, acetylene and benzine are isomeric (polymeric) with each other in this sense. See Polymeric. (b) Metameric; i. e., having the same elements united in the same proportions by weight, and with the same molecular weight, but which a different structure or arrangement of the ultimate parts; as, ethyl alcohol and methyl ether are isomeric (metameric) with each other in this sense. See Metameric.
ISOMERIDEI*som"er*ide, n. (Chem.)
Defn: An isomer. [R.]
ISOMERISMI*som"er*ism, n. (Chem.)
Defn: The state, quality, or relation, of two or more isomeric substances. Physical isomerism (Chem.), the condition or relation of certain (metameric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and lævo-tartaric acids. In such compounds there is usually at least one unsymmetrical carbon atom. See Unsymmetrical.
ISOMEROMORPHISMI`so*mer`o*mor"phism, n. Etym: [Isomer + Gr. ism.] (Crystallog.)
Defn: Isomorphism between substances that are isomeric.
ISOMETRIC; ISOMETRICALI`so*met"ric, I`so*met"ric*al, a. Etym: [Iso- + Gr.
1. Pertaining to, or characterized by, equality of measure.
2. (Crystallog.)
Defn: Noting, or conforming to, that system of crystallization in which the three axes are of equal length and at right angles to each other; monometric; regular; cubic. Cf. Crystallization. Isometric lines (Thermodynamics), lines representing in a diagram the relations of pressure and temperature in a gas, when the volume remains constant. — Isometrical perspective. See under Perspective. — Isometrical projection, a species of orthographic projection, in which but a single plane of projection is used. It is so named from the fact that the projections of three equal lines, parallel respectively to three rectangular axes, are equal to one another. This kind of projection is principally used in delineating buildings or machinery, in which the principal lines are parallel to three rectangular axes, and the principal planes are parallel to three rectangular planes passing through the three axes.
ISOMORPHI"so*morph, n. Etym: [See Isomorphous.]
Defn: A substance which is similar to another in crystalline form and composition.
ISOMORPHICI`so*mor"phic, a.
Defn: Isomorphous.
ISOMORPHISMI`so*mor"phism, n. Etym: [Cf. F. isomorphisme.] (Crystallog.)
Defn: A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO4) and strontium (SrSO4). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homoeomorphism.
ISOMORPHOUSI`so*mor"phous, a. Etym: [Iso- + -morphous.]
Defn: Having the quality of isomorphism.
ISONANDRAI`so*nan"dra, n. Etym: [Iso- + Gr. (Bot.)
Defn: A genus of sapotaceous trees of India. Isonandra Gutta is the principal source of gutta-percha.
ISONEPHELICI`so*ne*phel"ic, a. Etym: [Iso- + Gr. (Phys. Geog.)
Defn: Having, or indicating, an equal amount of cloudiness for a given period; as, isonephelic regions; an isonephelic line.
ISONICOTINEI`so*nic"o*tine, n. Etym: [Iso- + nicotine.] (Chem.)
Defn: A crystalline, nitrogenous base, C10H14N2, isomeric with nicotine.
ISONICOTINIC I`so*nic`o*tin"ic, a. (Chem.) (a) Pertaining to, or derived from, isonicotine. (b) Pertaining to, or designating, an acid isomeric with nicotinic acid.
ISONITROSO-I`so*ni*tro"so-. Etym: [Iso- + nitroso-.] (Chem.)
Defn: A combining from (also used adjectively), signifying: Pertaining to, or designating, the characteristic, nitrogenous radical, NOH, called the isonitroso group.
ISONOMICI`so*nom"ic, a. Etym: [Gr.
Defn: The same, or equal, in law or right; one in kind or origin; analogous; similar. Dana.
ISONOMYI*son"o*my, n. Etym: [Gr. isonomie. See Isonomic.]
Defn: Equal law or right; equal distribution of rights and privileges; similarity.
ISOPATHY I*sop"a*thy, n. Etym: [Iso- + Gr. (Med.) (a) The system which undertakes to cure a disease by means of the virus of the same disease. (b) The theory of curing a diseased organ by eating the analogous organ of a healthy animal. Mayne. (c) The doctrine that the power of therapeutics is equal to that of the causes of disease.
ISOPEPSINI`so*pep"sin, n. Etym: [Iso- + pepsin.] (Physiol. Chem.)
Defn: Pepsin modified by exposure to a temperature of from 40º to 60ºC.
ISOPERIMETRICALI`so*per`i*met"ric*al, a. Etym: [Gr. isopérimètre. See Perimeter.](Geom.)
Defn: Having equal perimeters of circumferences; as, isoperimetrical figures or bodies.
ISOPERIMETRYI`so*per*im"e*try, n. (Geom.)
Defn: The science of figures having equal perimeters or boundaries.
ISOPIESTICI`so*pi*es"tic, a. Etym: [Iso- + Gr. (Thermodynamics)
Defn: Having equal pressure. Isopiestic lines, lines showing, in a diagram, the relations of temperature and volume, when the elastic force is constant; — called also isobars.
ISOPLEURAI`so*pleu"ra, n. pl. Etym: [NL. See Iso-, and Pleura.] (Zoöl.)
Defn: A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.
Note: The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons (Polyplacophora), together with Neomenia and Chætoderma, which are wormlike forms without a shell.
ISOPODI"so*pod, a. (Zoöl.)
Defn: Having the legs similar in structure; belonging to the Isopoda.— n.
Defn: One of the Isopoda.
ISOPODAI*sop"o*da, n. pl. Etym: [NL. See Iso-, and -poda.] (Zoöl.)
Defn: An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.
Note: The body is usually depressed, with the abdominal segments short, and often consolidated in part. The branchiæ are on the abdominal appendages. The group includes the terrestrial pill bugs and sow bugs, with numerous marine forms. See Arthrostrata, Gribble.
ISOPODIFORMI`so*pod"i*form, a. Etym: [Isopod + -form.] (Zoöl.)
Defn: Having the shape of an isopod; — said of the larvæ of certain insects.
ISOPODOUSI*sop"o*dous, a.
Defn: Same as Isopod.
ISOPOGONOUSI`so*pog"o*nous, a. Etym: [Iso- + Gr. (Zoöl.)
Defn: Having the two webs equal in breath; — said of feathers.
ISOPRENEI"so*prene, n. Etym: [Etymol. uncertain.] (Chem.)
Defn: An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.C5H8 — unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons
ISOPYCNICI`so*pyc"nic, a. Etym: [Iso- + Gr. pykno`s dense.] (Physics)
Defn: Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.
ISOPYCNICI`so*pyc"nic, n. (Physics)
Defn: A line or surface passing through those points in a medium, at which the density is the same.
ISORCINI*sor"cin, n. Etym: [Iso- + orcin.] (Chem.)
Defn: A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; — called also cresorcin.
ISORROPIC I`sor*rop"ic, a. Etym: [Gr. 'iso`rropos in equipoise; 'i`sos equal + "roph` downward inclination or momentum.]
Defn: Of equal value. Isorropic line (in a diagram) (Geom.), the locus of all the points for which a specified function has a constant value. Newcomb.
ISOSCELESI*sos"ce*les, a. Etym: [L., fr. Gr. 'i`sos equal + (Geom.)
Defn: Having two legs or sides that are equal; — said of a triangle.
ISOSPONDYLII`so*spon"dy*li, n. pl. Etym: [NL., fr. Gr. 'i`sos equal + (Zoöl.)
Defn: An extensive order of fishes, including the salmons, herrings, and many allied forms.
ISOSPONDYLOUSI`so*spon"dy*lous, a. (Zoöl.)
Defn: Of or pertaining to the Isospondyli; having the anterior vertebræ separate and normal.
ISOSPORE I"so*spore, n. (Biol.) (a) One of the spores produced by an isosporous organism. (b) A zygospore.
ISOSPORICI`so*spor"ic, a. Etym: [Iso- + Gr. (Bot.)
Defn: Producing but one kind of spore, as the ferns and Equiseta. Cf.Heterosporic.
ISOSPOROUSI*sos"po*rous, a. [Iso- + Gr. fruit.] (Biol.)
Defn: Producing but one kind of spore, as the ferns.
ISOSTASYI*sos"ta*sy, n. [See Iso-; Stasis.]
Defn: The state or quality of being isostatic. Specif. (Geol.),
Defn: general equilibrium in the earth's crust, supposed to be maintained by the yielding or flow of rock material beneath the surface under gravitative stress. By the theory of isostasy each unit column of the earth, from surface to center, has approximately the same weight, and the continents stand higher than the ocean beds chiefly because the material of the crust has there less density.