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[ C ] informal
James is a tennis nut - he plays every day .
See also
[ C ] music specialized
The top two strings have been left a little high at the nut.
A violin is usually played using a bow consisting of a stick with a ribbon of horsehair strung between the tip and nut at opposite ends .
Synonym
More examples Fewer examples (Definition of nut from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)