English definition of “nut”
/nʌt/ noun [C]
FOOD › the dry fruit of some trees which grows in a hard shell, and can often be eaten: a brazil/cashew nut
METAL › a piece of metal with a hole in it through which you put a bolt (= metal pin) to hold pieces of wood or metal together
KEEN informal › a person who is keen on a particular subject or hobby: She's a real sports nut.