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Shell

/ʃel/

An outer covering or protective layer that encases something.

Synonyms:

This word has no antonyms

There is nothing sad about empty shells."With these shells falling, it may be at any time.'There were many more bones and old shells on this beach.

From Old English scell or sciell, originating from Proto-Germanic skaljo, related to Dutch schel, German Schale, and Latin calyx.

17 mentions per 1 million words

Moderate

Hint: Frequency according to COCA