爱词海
yearning (n.)youdaoicibaDictYouDict[yearning 词源字典]
Old English gierning, verbal noun from yearn (v.). Related: Yearningly. [yearning etymology, yearning origin, 英语词源]
yeastyoudaoicibaDictYouDict[yeast 词源字典]
yeast: [OE] Yeast is etymologically a substance that causes ‘fermentation’. For its ultimate source is the Indo-European base *jes- ‘boil, foam, froth’, which also produced Greek zeín ‘boil’ (source of English eczema) and Welsh iās ‘seething’. Its Germanic descendant produced German gischt ‘yeast, froth’, Dutch gist, gest ‘yeast’, and English yeast.
=> eczema[yeast etymology, yeast origin, 英语词源]
yeast (n.)youdaoicibaDictYouDict
Old English gist "yeast, froth," from Proto-Germanic *jest- (cognates: Old Norse jastr, Swedish jäst, Middle High German gest, German Gischt "foam, froth," Old High German jesan, German gären "to ferment"), from PIE root *yes- "to boil, foam, froth" (cognates: Sanskrit yasyati "boils, seethes," Greek zein "to boil," Welsh ias "seething, foaming").
yeasty (adj.)youdaoicibaDictYouDict[yeasty 词源字典]
1590s, from yeast + -y (2).[yeasty etymology, yeasty origin, 英语词源]
yuck (1)youdaoicibaDictYouDict[yuck 词源字典]
exclamation of disgust, 1966, origin perhaps echoic (compare Newfoundland slang yuck "to vomit," 1963; U.S. slang yuck "despised person," 1943; provincial English yuck "the itch, mange, scabies"). Variant yech is by 1969.[yuck etymology, yuck origin, 英语词源]
yegg (n.)youdaoicibaDictYouDict[yegg 词源字典]
also yegg-man, 1901, a word popular in the first decade of the 20th century and meaning vaguely "hobo burglar; safe-breaker; criminal beggar."
The great majority [of the Chicago criminal population] are what certain detectives call "Yegg-men," which is a term, by the way, that the detectives would do well to define. As far as I can discover it means tramp-thieves, but the average tramp seldom uses the word. Hoboes that break safes in country post-offices come under the Yegg-men classification." [McClure's Magazine, Feb. 1901]
Popularized by the Pinkerton agency detectives. The 1900 "Proceedings of the 26th annual convention of the American Bankers' Association," whose members were protected by the Pinkerton's National Detective Agency, reported a letter dated Nov. 23 or 24, 1899, returning $540, taken earlier that year, to the Scandinavian-American Bank of St. Paul, Minn., noting that the thieves had been so hounded by detectives that they gave up the gains and advised the bank to advertise that it was a member of the American Bankers Association, because "the American Bankers Association is too tough for poor 'grafters.'" The letter supposedly was signed "John Yegg," but this was said to be a pseudonym and the report identified the man arrested later in the case as William Barrett. [yegg etymology, yegg origin, 英语词源]
yolk (n.)youdaoicibaDictYouDict[yolk 词源字典]
Old English geolca, geoloca "yolk," literally "the yellow part," from geolu "yellow" (see yellow (adj.)). Formerly also spelled yelk.[yolk etymology, yolk origin, 英语词源]
yellyoudaoicibaDictYouDict[yell 词源字典]
yell: see nightingale
[yell etymology, yell origin, 英语词源]
yell (v.)youdaoicibaDictYouDict
Old English giellan (West Saxon), gellan (Mercian) "to yell, sound, shout," class III strong verb (past tense geal, past participle gollen), from Proto-Germanic *gel- (cognates: Old Norse gjalla "to resound," Middle Dutch ghellen, Dutch gillen, Old High German gellan, German gellen "to yell"), extended form of root of Old English galan "to sing" (source of the -gale in nightingale); from PIE *ghel- (1) "to call, cry out, shout, sing" (cognates: Greek kikhle "thrush," khelidon "the swallow"). Intransitive sense from early 13c. Related: Yelled; yelling.
yell (n.)youdaoicibaDictYouDict
late 14c., originally in Scottish, from yell (v.).
yellowyoudaoicibaDictYouDict[yellow 词源字典]
yellow: [OE] Yellow is a member of an ancient and widespread family of European colourterms descended from Indo-European *ghel-, *ghol-, which denoted both ‘yellow’ and ‘green’. From it were descended Latin helvus ‘yellowish’ and possibly galbus ‘greenishyellow’ (source of French jaune ‘yellow’ and English jaundice), Greek kholé ‘bile’ (source of English choleric, melancholy, etc), Russian zheltyj ‘yellow’, Lithuanian geltonas ‘yellow’, and English gall and gold.

In the Germanic languages it has produced German gelb, Dutch gel, Swedish and Danish gul, and English yellow. A yolk [OE] is etymologically a ‘yellow’ substance.

=> choleric, gall, gold, jaundice, melancholy, yolk[yellow etymology, yellow origin, 英语词源]
yellow (adj.)youdaoicibaDictYouDict
Old English geolu, geolwe, "yellow," from Proto-Germanic *gelwaz (cognates: Old Saxon, Old High German gelo, Middle Dutch ghele, Dutch geel, Middle High German gel, German gelb, Old Norse gulr, Swedish gul "yellow"), from PIE *ghel- (2) "to shine," with derivatives referring to bright materials and gold (see glass). For other Indo-European "yellow" words, see Chloe.

Occasionally in Middle English used of a color closer to blue-gray or gray, of frogs or hazel eyes, and to translate Latin caeruleus, glauco. Also as a noun in Old English. Meaning "light-skinned" (of blacks) first recorded 1808. Applied to Asiatics since 1787, though the first recorded reference is to Turkish words for inhabitants of India. Yellow peril translates German die gelbe gefahr. Sense of "cowardly" is 1856, of unknown origin; the color was traditionally associated rather with jealousy and envy (17c.). Yellow-bellied "cowardly" is from 1924, probably a semi-rhyming reduplication of yellow; earlier yellow-belly was a sailor's name for a half-caste (1867) and a Texas term for Mexican soldiers (1842, based on the color of their uniforms). Yellow dog "mongrel" is attested from c. 1770; slang sense of "contemptible person" first recorded 1881. Yellow fever attested from 1748, American English (jaundice is a symptom).
yellow (v.)youdaoicibaDictYouDict
Old English geoluwian "to become yellow," from the source of yellow (adj.). Transitive sense from 1590s. Related: Yellowed; yellowing.
yellowcake (n.)youdaoicibaDictYouDict[yellowcake 词源字典]
oxide of uranium, 1950, from yellow (adj.) + cake (n.).[yellowcake etymology, yellowcake origin, 英语词源]
yellowy (adj.)youdaoicibaDictYouDict[yellowy 词源字典]
1660s, from yellow (n.) + -y (2).[yellowy etymology, yellowy origin, 英语词源]