inquisitor (n.)youdaoicibaDictYouDict[inquisitor 词源字典]
c. 1400, from Old French inquisiteur (c. 1400) or directly from Latin inquisitor "searcher, examiner," in law, "an investigator, collector of evidence," agent noun from Latin inquirere (see inquire). As the title of an officer of the Inquisition, from 1540s. Related: Inquisitorial.[inquisitor etymology, inquisitor origin, 英语词源]
inroyoudaoicibaDictYouDict
1610s, from Japanese, from Chinese yin "seal" + lung "basket."
inroad (n.)youdaoicibaDictYouDict
1540s, "hostile incursion, raid, foray," from in- (2) "in;" second element is road in the obsolete sense of "riding;" related to raid. Related: Inroads.
insalubrious (adj.)youdaoicibaDictYouDict
1630s, from Latin insalubris "unhealthy, unwholesome," from in- "not" (see in- (1)) + salubris (see salubrious).
insane (adj.)youdaoicibaDictYouDict
1550s, from Latin insanus "mad, insane; outrageous, excessive, extravagant," from in- "not" (see in- (1)) + sanus "well, healthy, sane" (see sane). Originally only of persons; of actions, from 1842. Compare lunatic; and Italian pazzo "insane," originally a euphemism, from Latin patiens "suffering." German verrückt, literally past participle of verrücken "to displace," "applied to the brain as to a clock that is 'out of order' " [Buck]. The noun meaning "insane person" is attested from 1786.
insanity (n.)youdaoicibaDictYouDict
1580s, "state of being insane," from Latin insanitatem (nominative insanitas) "unhealthfulness," noun of quality from insanus (see insane). Meaning "extreme folly" is from 1844.
insatiability (n.)youdaoicibaDictYouDict
1650s, from Late Latin insatiabilitas, from insatiabilis (see insatiable).
insatiable (adj.)youdaoicibaDictYouDict
early 15c., insaciable, from Old French insaciable (13c.), or directly from Late Latin insatiabilis "not to be satisfied," from in- "not, opposite of" (see in- (1)) + satiabilis, from satiare (see satiate). Related: Insatiably.
insatiate (adj.)youdaoicibaDictYouDict
mid-15c., insaciate, from Latin insatiatus "unsatisfied," from in- "not, opposite of" (see in- (1)) + satiatus, past participle of satiare (see satiate).
inscribe (v.)youdaoicibaDictYouDict
1550s (form inscriven is from late 14c.), from Latin inscribere "to write in or on," (see inscription). Meaning "to dedicate (by means of an inscription)" is from 1640s. Related: Inscribed; inscribing.
inscription (n.)youdaoicibaDictYouDict
late 14c., from Latin inscriptionem (nominative inscriptio) "a writing upon, inscription," noun of action from past participle stem of inscribere "inscribe, to write on or in anything," from in- "in" (see in- (2)) + scribere "to write" (see script (n.)).
inscrutability (n.)youdaoicibaDictYouDict
1650s, from inscrutable + -ity.
inscrutable (adj.)youdaoicibaDictYouDict
c. 1500, from Late Latin inscrutabilis, from in- "not, opposite of" (see in- (1)) + scrutabilis, from scrutari "examine, ransack" (see scrutiny). Related: Inscrutably.
insect (n.)youdaoicibaDictYouDict
c. 1600, from Latin (animal) insectum "(animal) with a notched or divided body," literally "cut into," from neuter past participle of insectare "to cut into, to cut up," from in- "into" (see in- (2)) + secare "to cut" (see section (n.)). Pliny's loan-translation of Greek entomon "insect" (see entomology), which was Aristotle's term for this class of life, in reference to their "notched" bodies.

First in English in 1601 in Holland's translation of Pliny. Translations of Aristotle's term also form the usual word for "insect" in Welsh (trychfil, from trychu "cut" + mil "animal"), Serbo-Croatian (zareznik, from rezati "cut"), Russian (nasekomoe, from sekat "cut"), etc.
insecticide (n.)youdaoicibaDictYouDict
"substance which kills insects," 1865, from insect + -cide.
insectivore (n.)youdaoicibaDictYouDict
1863, from French insectivore (1817), from Latin insectivorus, from comb. form of insectum (see insect) + vorare "devour, swallow" (see voracity).
insectivorous (adj.)youdaoicibaDictYouDict
1610s; see insect + -vorous.
insecure (adj.)youdaoicibaDictYouDict
1640s, "unsafe," from Medieval Latin insecurus, from in- "not" (see in- (1)) + Latin securus (see secure). Psychological sense dates from 1935; insecurity in this sense dates from 1917. Related: Insecurely.
insecurity (n.)youdaoicibaDictYouDict
1640s, from Medieval Latin insecuritas, from insecurus (see insecure). Specific psychological sense is by 1917.
inseminate (v.)youdaoicibaDictYouDict
1620s, "to cast as seed," from Latin inseminatus, past participle of inseminare "to sow, implant," from in- "in" (see in- (2)) + semen (genitive semenis) "seed." Meaning "to impregnate with semen" is attested from 1923. Related: Inseminated; inseminating.