WordReference Random House Unabridged Dictionary of American English © 2026
her′mit crab′, 
  1. Invertebratesany of numerous crabs, esp. of the genera Pagurus and Eupagurus, that protect their soft uncovered abdomen by occupying the castoff shell of a univalve mollusk.
  • 1725–35

Collins Concise English Dictionary © HarperCollins Publishers::
hermit crab n
  1. 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
'hermit crab' also found in these entries (note: many are not synonyms or translations):
crab - pagurian
In Lists: Pets, more...

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