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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Example sentences
Add a small amount of fresh lemon juice, salt and pepper to taste and mix.
The winds had already affected our local plum and lemon trees.
Think vividly of cutting open a juicy lemon and then bringing it towards your
  face and finally biting down of the sour fruit.
Milk, lemon juice or baking soda mixed with water can be used as invisible ink.
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