Definition of lemon noun from the Oxford Advanced American Dictionary

      

    lemon

     noun
    noun
    NAmE//ˈlɛmən//
     
     
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  1. 1[countable, uncountable] a yellow citrus fruit with a lot of sour juice. Slices of lemon and lemon juice are used in cooking and drinks lemon tea You need a lot of lemons to make lemonade. Squeeze the juice of half a lemon over the fish. a lemon tree
  2. 2 [uncountable] lemon juice or a drink made from lemon
  3. 3(also lemon yellow) [uncountable] a pale yellow color
  4. 4 [countable] (informal) a thing, especially a car, that is useless because it does not work as it should synonym dud
See the Oxford Advanced Learner's Dictionary entry: lemon