Etymology
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yuck (1)
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.
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yucky (adj.)
1970, from yuck (1) + -y (2). Related: Yuckiness.
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Yugoslav (n.)
1853, from Slav + Serbo-Croatian jugo- "south," combining form of jug "south, south wind, noon," from Old Church Slavonic jugu "south, south wind, noon."
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Yugoslavia 
1929 (earlier the country was Kingdom of the Serbs, Croats, and Slovenes); from Yugoslav + -ia. The name vanished from the map in 2003.
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yuk (n.)
"laughter, something evoking laughs," 1964, imitative; see yuck (2).
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Yukon 
territory of northwestern Canada, named for the river, from Athabaskan, perhaps Koyukon yookkene or Lower Tanana yookuna, said to mean "big river."
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yule (n.)

Old English geol, geola "Christmas Day, Christmastide," which is cognate with Old Norse jol (plural), the name of a heathen feast, later taken over by Christianity; the Germanic word is of unknown origin. The Old English (Anglian) cognate giuli was the Anglo-Saxons' name for a two-month midwinter season corresponding to Roman December and January, a time of important feasts but not itself a festival.

After conversion to Christianity the word narrowed to mean "the 12-day feast of the Nativity" (which began Dec. 25), but was replaced by Christmas by 11c., except in the northeast (areas of Danish settlement), where it remained the usual word.

Revived 19c. by writers to mean "the Christmas of 'Merrie England.' " First direct reference to the Yule log is 17c. According to some sources, Old Norse jol was borrowed into Old French as jolif, hence Modern French joli "pretty, nice," originally "festive" (see jolly).

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yum (interj.)
exclamation of pleasure, attested from 1878.
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Yuma 
native people of Arizona, also their language, of the Yuman family, the name probably is from O'odham (Piman) yu'mi and represents the name the Piman peoples applied to the Yuma people.
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