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oyster crab

noun
1.
a pea crab, Pinnotheres ostreum, the female of which lives as a commensal within the mantle cavity of oysters.
Origin
1750-1760
1750-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for oyster crab

oyster crab

noun
1.
any of several small soft-bodied crabs of the genus Pinnotheres, esp P. ostreum, that live as commensals in the mantles of oysters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for oyster crab

Few English speakers likely know this word

Word Value for oyster

9
8
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