oyster

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

any of various bivalve mollusks with an irregularly shaped, unequal shell, living attached to rocks, other shells, etc., and widely used as food
the soft, edible part of such a mollusk
the oyster-shaped bit of meat contained in a depression on each side of the pelvic bone of a fowl
something from which profit or advantage can be extracted: the world is my oyster
Informal a taciturn person

Origin: OFr oistre < L ostrea < Gr ostreon, oyster; akin to osteon, a bone: see ossify

intransitive verb

to gather, raise, or dredge oysters

See oyster in American Heritage Dictionary 4

noun

a. Any of several edible bivalve mollusks of the family Ostreidae, especially of the genera Crassostrea and Ostrea, that live chiefly in shallow marine waters and have a rough, irregularly shaped shell.
b. Any of various similar or related bivalve mollusks, such as the pearl oyster.
An edible bit of muscle found in the hollow of the pelvic bone of a fowl.
a. A special delicacy.
b. Something from which benefits may be extracted.
Slang A close-mouthed person.