Definition of "lemon" in English

noun

1. A yellowish citrus fruit.

2. A semitropical evergreen tree, Citrus limon, that bears such fruits.

3. A more or less bright shade of yellow associated with lemon fruits.

4. (uncountable, rare) Lemon juice.

5. A lemon shark (Negaprion brevirostris).

6. (slang) A defective or inadequate item or individual.

   • He didn’t realise until he’d paid for it that the car was a lemon.

7. (Cockney rhyming slang, shortened from “lemon flavour”) Favor.

   • A thousand quid for that motor? Do me a lemon! I could get it for half that.

8. (dated, fandom slang) A piece of fanfiction involving explicit sex.

9. (geometry) The surface of revolution of a circular arc of angle less than 180° rotated about the straight line passing through the arc’s two endpoints.

adjective

1. Containing or having the flavour/flavor and/or scent of lemons.

2. Of the pale yellow colour/color of lemons.

3. (Cockney rhyming slang, from "lemon tart") Smart; cheeky, vocal.

verb

1. (transitive) To flavour with lemon.

   • You can start the vegetables cooking while you are lemoning the fish.