nut - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “nut”

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nut

noun [C]  us   /nʌt/

nut noun [C] (FOOD)

the dry fruit of some trees, consisting of an edible seed within a hard, outer shell, or the seed itself

nut noun [C] (METAL OBJECT)

a small ring of metal that a bolt (= screw without a pointed end) can be screwed into to hold something in place: a wing nut (= a nut with flat edges for turning)

nut noun [C] (PERSON)

infml a person who is crazy, foolish, or strange: What kind of nut would leave a computer in his car overnight with the doors unlocked? infml A nut is also a person who is extremely enthusiastic about a particular activity or thing: Joyce is a nut for antiques – we’ve got a house full of them.
(Definition of nut from the Cambridge Academic Content Dictionary © Cambridge University Press)
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