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The meaning of NUTSHELL is the hard external covering in which the kernel of a nut is enclosed.

Idiom in a nutshell (Definition of nutshell from the Cambridge Academic Content Dictionary © Cambridge University Press)

The expression "in a nutshell" (of a story, proof, etc.) means "in essence ", metaphorically alluding to the fact that the essence of the nut – its edible part – is contained inside its shell.

NUTSHELL definition: the shell of a nut. See examples of nutshell used in a sentence.

Definition of nutshell noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Define nutshell. nutshell synonyms, nutshell pronunciation, nutshell translation, English dictionary definition of nutshell. n. The shell enclosing the meat of a nut. Idiom: in a nutshell In a few words; …

nutshell in American English (ˈnʌtˌʃɛl ) noun the shell enclosing the kernel of a nut

nut•shell (nut′ shel′), n. the shell of a nut. Idioms in a nutshell, in very brief form; in a few words: Just tell me the story in a nutshell.

There are eight meanings listed in OED's entry for the word nutshell, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.