hermit crab

noun
any of numerous crabs, especially of the genera Pagurus and Eupagurus, that protect their soft uncovered abdomen by occupying the castoff shell of a univalve mollusk.

Origin:
1725–35

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World English Dictionary
hermit crab
 
n
any small soft-bodied decapod crustacean of the genus Pagurus and related genera, living in and carrying about the empty shells of whelks or similar molluscs

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There was a hermit crab inside and it pinched her ear.
The body of the hermit crab is a tapered spiral to match the inside of the shells.
Take an extra look to see if the shell is indeed inhabited by a snail, or if a hermit crab has moved in.
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