英语词源字典 - 在线词源网站

ipsilateral (adj.)[ipsilateral 词源字典]: 1907, from Latin ipse "self" + lateral.[ipsilateral etymology, ipsilateral origin, 英语词源]
ipso facto: Latin, literally "by that very fact."
ir-: assimilated form of Latin prefixes in- (see in-) before -r-.
Ira: masc. proper name, from Hebrew, literally "watchful," from stem of 'ur "to awake, to rouse oneself."
Iran: from Persian Iran, from Middle Persian Ērān "(land) of the Iranians," genitive plural of ēr- "an Iranian," from Old Iranian *arya- (Old Persian ariya-, Avestan airya-) "Iranian", from Indo-Iranian *arya- or *ārya- (see Aryan), a self-designation, perhaps meaning "compatriot." In 1935 the government of Reza Shah Pahlavi requested governments with which it had diplomatic relations to call his country Iran, after the indigenous name, rather than the Greek-derived Persia.
Iranian: 1841 (adj.); 1873 (n.), from Iran + -ian.
Iraq: country name, 1920, from an Arabic name attested since 6c. for the region known in Greek as Mesopotamia; often said to be from Arabic `araqa, covering notions such as "perspiring, deeply rooted, well-watered," which may reflect the impression the lush river-land made on desert Arabs. But the name may be from, or influenced by, Sumerian Uruk (Biblical Erech), anciently a prominent city in what is now southern Iraq (from Sumerian uru "city").
irascibility (n.): 1750, from irascible + -ity.
irascible (adj.): late 14c., from Middle French irascible (12c.) and directly from Late Latin irascibilis, from Latin irasci "be angry, be in a rage," from ira "anger" (see ire).
irate (adj.): 1838, from Latin iratus "angry, enraged, violent, furious," past participle of irasci "grow angry," from ira "anger" (see ire).
ire (n.): c. 1300, from Old French ire "anger, wrath, violence" (11c.), from Latin ira "anger, wrath, rage, passion," from PIE root *eis- (1), forming various words denoting "passion" cognates: Greek hieros "filled with the divine, holy," oistros "gadfly," originally "thing causing madness;" Sanskrit esati "drives on," yasati "boils;" Avestan aesma "anger;" Lithuanian aistra "violent passion").

Old English irre in a similar sense is from an adjective irre "wandering, straying, angry," cognate with Old Saxon irri "angry," Old High German irri "wandering, deranged," also "angry;" Gothic airzeis "astray," and Latin errare "wander, go astray, angry" (see err (v.)). (cognates: Avestan aešma- "anger," Lithuanian aistra "violent passion," Latin ira "anger")
Ireland: 12c., Anglo-Norman, with land + native Eriu (see Irish).
Irene: fem. proper name, from French Irène, from Latin Irene, from Greek Eirene, literally "peace, time of peace."
irenic (adj.): 1864; see eirenic.
irenology (n.): "study of peace," 1974, from Greek eirene "peace" + -ology. Related: Irenological.
Irgun: militant Zionist organization, 1946, from Modern Hebrew, literally "organization," in full Irgun Zvai Leumi "national military organization."
iridescence (n.): 1804, from iridescent + -ence. Related: Iridescency (1799).
iridescent (adj.): 1796, literally "rainbow-colored," coined from comb. form of Latin iris (genitive iridis) "rainbow" (see iris). Related: Iridescently.
iridium (n.): 1804, Modern Latin, coined by its discoverer, English chemist Smithson Tennant (1761-1815) from Greek iris (genitive iridos) "rainbow;" so called for "the striking variety of colours which it gives while dissolving in marine acid" [Tennant]
iris (n.): late 14c., flowering plant (Iris germanica), also "prismatic rock crystal," from Latin iris (plural irides) "iris of the eye, iris plant, rainbow," from Greek iris (genitive iridos) "a rainbow; the lily; iris of the eye," originally "messenger of the gods," personified as the rainbow. The eye region was so called (early 15c. in English) for being the colored part; the Greek word was used of any brightly colored circle, "as that round the eyes of a peacock's tail" [Liddell & Scott].