The definition of an oyster is a bivalve mollusk with an irregular long shell that is normally attached to rocks and that is consumed as food.
(noun)A bivalve mollusk that is taken from the ocean and served raw as part of a seafood buffet is an example of an oyster.
See oyster in Webster's New World College Dictionary
noun
Origin: OFr oistre < L ostrea < Gr ostreon, oyster; akin to osteon, a bone: see ossify
intransitive verb
See oyster in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English oistre
Origin: , from Old French
Origin: , from Latin ostreum, ostrea
Origin: , from Greek ostreon; see ost- in Indo-European roots
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