the yellowish, acid fruit of a subtropical citrus tree, Citrus limon.
the tree itself.
Informal. a person or thing that proves to be defective, imperfect, or unsatisfactory; dud: His car turned out to be a lemon.
made of or with lemon.
having the color, taste, or odor of lemon.

1350–1400; 1905–10 for def 4; < Medieval Latin lemōnium; replacing Middle English lymon < Medieval Latin līmō, (stem līmōn-) < Persian līmū, līmun

lemonish, adjective
lemonlike, lemony, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lemon (ˈlɛmən)
1.  a small Asian evergreen tree, Citrus limon, widely cultivated in warm and tropical regions, having pale green glossy leaves and edible fruitsRelated: citric, citrine, citrous
2.  a.  the yellow oval fruit of this tree, having juicy acidic flesh rich in vitamin C
 b.  (as modifier): a lemon jelly
3.  Also called: lemon yellow
 a.  a greenish-yellow or strong yellow colour
 b.  (as adjective): lemon wallpaper
4.  a distinctive tart flavour made from or in imitation of the lemon
5.  slang a person or thing considered to be useless or defective
Related: citric, citrine, citrous
[C14: from Medieval Latin lemōn-, from Arabic laymūn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

type of citrus fruit, c.1400, from O.Fr. limon "citrus fruit," from O.Prov., from Arabic laimun or Pers. limu(n), generic terms for citrus fruits (compare lime); cognate with Skt. nimbu "the lime." Slang meaning "a Quaalude" is 1960s, from Lemmon, name of a pharmaceutical company that once manufactured
the drug.

"worthless thing," 1909, Amer.Eng. slang; from lemon (1), perhaps via criminal slang sense of "a person who is a loser, a simpleton," which is perhaps from the notion of someone a sharper can "suck the juice out of." A pool hall hustle was called a lemon game (1908); while
to hand someone a lemon was British slang (1906) for "to pass off a sub-standard article as a good one." Or it simply may be a metaphor for something which "leaves a bad taste in one's mouth."
Online Etymology Dictionary, © 2010 Douglas Harper
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