Irish (n.)youdaoicibaDictYouDict[Irish 词源字典]
c. 1200, Irisce, from stem of Old English Iras "inhabitant of Ireland," from Old Norse irar, ultimately from Old Irish Eriu (accusative Eirinn, Erinn) "Erin," which is from Old Celtic *Iveriu (accusative *Iverionem, ablative *Iverione), perhaps from PIE *pi-wer- "fertile," literally "fat," from root *peie- "to be fat, swell" (see fat (adj.)).

Meaning "temper, passion" is 1834, American English (first attested in writings of Davy Crockett), from the legendary pugnacity of Irish people. Irish-American is from 1832; Irish stew is attested from 1814; Irish coffee is from 1950. Wild Irish (late 14c.) originally were those not under English rule; Black Irish in reference to those of Mediterranean appearance is from 1888.[Irish etymology, Irish origin, 英语词源]
Irishman (n.)youdaoicibaDictYouDict
c. 1200, from Irish + man (n.).
irk (v.)youdaoicibaDictYouDict
mid-15c., irken "be weary of, be disgusted with;" earlier intransitive, "to feel weary" (early 14c.). Of uncertain origin, perhaps related to Old Norse yrkja "work" (from PIE root *werg- "to work;" see organ), or Middle High German erken "to disgust." Modern sense of "annoy" is from late 15c. An adjective, irk "weary, tired" is attested from c. 1300 in northern and midlands writing.
irksome (adj.)youdaoicibaDictYouDict
"bothersome, burdensome," early 15c., from irk + -some (1). Related: Irksomely; irksomeness.
IrmayoudaoicibaDictYouDict
fem. proper name; see Emma.
iron (n.)youdaoicibaDictYouDict
Old English isærn (with Middle English rhotacism of -s-) "the metal iron; an iron weapon," from Proto-Germanic *isarnan (cognates: Old Saxon isarn, Old Norse isarn, Middle Dutch iser, Old High German isarn, German Eisen) "holy metal" or "strong metal" (in contrast to softer bronze) probably an early borrowing of Celtic *isarnon (compare Old Irish iarn, Welsh haiarn), from PIE *is-(e)ro- "powerful, holy," from PIE *eis "strong" (cognates: Sanskrit isirah "vigorous, strong," Greek ieros "strong").
Right so as whil that Iren is hoot men sholden smyte. [Chaucer, c. 1386]
Chemical symbol Fe is from the Latin word for the metal, ferrum (see ferro-). Meaning "metal device used to press or smooth clothes" is from 1610s. The adjective is Old English iren, isern. To have (too) many irons in the fire "to be doing too much at once" is from 1540s. Iron lung "artificial respiration tank" is from 1932.
iron (v.)youdaoicibaDictYouDict
c. 1400, irenen, "to make of iron," from iron (n.). Meaning "press clothes" (with a heated flat-iron) is recorded from 1670s. Related: Ironed; ironing.
Iron AgeyoudaoicibaDictYouDict
1590s, originally from Greek and Roman mythology, the last and worst age of the world; the archaeological sense of "period in which humans used iron tools and weapons" is from 1879.
Iron CrossyoudaoicibaDictYouDict
from German das eiserne kreuz, instituted by Frederick Wilhelm III of Prussia, originally for distinguished military service in the wars against Napoleon.
Iron Curtain (n.)youdaoicibaDictYouDict
in reference to the Soviet occupation of Eastern Europe, famously coined by Winston Churchill March 5, 1946, in speech at Westminster College, Fulton, Missouri, but it had been used earlier in this context (for example by U.S. bureaucrat Allen W. Dulles at a meeting of the Council on Foreign Relations, Dec. 3, 1945). The figurative sense of "impenetrable barrier" is attested from 1819, and the specific sense of "barrier at the edge of the sphere of influence of the Soviet Union" is recorded from 1920. During World War II, Goebbels used it in German (ein eiserner Vorhang) in the same sense. Its popular use in the U.S. dates from Churchill's speech.
iron-grayyoudaoicibaDictYouDict
Old English isengrægum; see iron (n.) + gray. The color of freshly broken cast iron.
iron-on (adj.)youdaoicibaDictYouDict
1959, from the verbal phrase, from iron (v.) + on (adv.).
ironclad (adj.)youdaoicibaDictYouDict
1852, of warships, American English, from iron (n.) + clad. Of contracts, etc., 1884. As a noun meaning "iron-clad ship," it is attested from 1862.
ironic (adj.)youdaoicibaDictYouDict
1620s, from Late Latin ironicus, from Greek eironikos "dissembling, putting on a feigned ignorance," from eironeia (see irony). Related: Ironical (1570s); ironically.
ironing (n.)youdaoicibaDictYouDict
"act of pressing and smoothing clothes with a heated flat-iron," c. 1710, from present participle of iron (v.). Ironing board attested from 1843.
IronsideyoudaoicibaDictYouDict
name given to a man of great hardihood or bravery, c. 1300, first applied to Edmund II, king of England (d.1016), later also to Oliver Cromwell and his troops. Old Ironsides as a nickname of U.S.S. "Constitution" dates from that ship's defeat of H.M.S. "Guerriere" on Aug. 19, 1812, in the War of 1812.
ironwork (n.)youdaoicibaDictYouDict
early 15c., from iron (n.) + work (n.).
irony (n.)youdaoicibaDictYouDict
c. 1500, from Latin ironia, from Greek eironeia "dissimulation, assumed ignorance," from eiron "dissembler," perhaps related to eirein "to speak" (see verb). Used in Greek of affected ignorance, especially that of Socrates. For nuances of usage, see humor. Figurative use for "condition opposite to what might be expected; contradictory circumstances" is from 1640s.
irony (adj.)youdaoicibaDictYouDict
"of or resembling iron," late 14c., from iron (n.) + -y (2).
IroquoisyoudaoicibaDictYouDict
1660s, from French (c. 1600); not an Iroquoian word, perhaps from an Algonquian language. Related: Iroquoian.