Definition of hermit crab
: any of numerous chiefly marine small decapod crustaceans (especially families Diogenidae, Paguridae, and Parapaguridae) having soft asymmetrical abdomens and occupying the empty shells of gastropods
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Merriam-Webster unabridged
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Time Traveler for hermit crab
The first known use of hermit crab was in 1735
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