|Origin:||limon, from Medieval Latin limo, from Arabic laymun|
1 [uncountable and countable]HBPDFF
a fruit with a hard yellow skin and sour juice:
a slice of lemon
Add a few drops of lemon juice.
2 [uncountable] British EnglishDFD
a drink that tastes of lemons:
a glass of fizzy lemon
3 also lemon yellow [uncountable]CC
a pale yellow colour
4 [countable] especially American English informal
something that is useless because it fails to work or to work properly:
I soon realized the van was a lemon.
5 [countable] British English informal
a silly person:
He just stood there looking like a real lemon.