lemon

Meaning

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. A lemon shark (Negaprion brevirostris).
5. (slang) A defective or inadequate item or individual.
6. (slang) Favor.
7. (slang) A piece of fanfiction involving explicit sex.
8. 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.

Adj

1. Containing or having the flavour/flavor and/or scent of lemons.
2. Of the pale yellow colour/color of lemons.
3. (slang) Smart; cheeky, vocal.

Verb

To flavour with lemon.

Pronounced as (IPA)

/ˈlɛm.ən/

Etymology

Inherited from Middle English lymon, from Old French lymon (“citrus”), from Arabic لَيْمُون (laymūn) or Persian لیمون (limon), from Persian لیمو (limu), from Sanskrit निम्बू (nimbū, “lime”), ultimately from Proto-Malayo-Polynesian *limaw or Munda. Likely doublet of lime.
The fandom sense is named after the erotic anime series Cream Lemon.