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  - oyer
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  - oyez
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  - Oyster Bay
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oyster crab

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WordReference Random House Unabridged Dictionary of American English © 2026

oys′ter crab′,

Invertebratesa pea crab, Pinnotheres ostreum, the female of which lives as a commensal within the mantle cavity of oysters.

1750–60

Collins Concise English Dictionary © HarperCollins Publishers::

oyster crab n

any of several small soft-bodied crabs of the genus Pinnotheres, esp P. ostreum, that live as commensals in the mantles of oysters

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