- 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.
A bivalve mollusk that is taken from the ocean and served raw as part of a seafood buffet is an example of an oyster.
A plate of oysters on ice.
oyster definition by Webster's New World
- 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: Old French oistre ; from Classical Latin ostrea ; from Classical Greek ostreon, oyster; akin to osteon, a bone: see ossify
oyster definition by American Heritage Dictionary
- 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.
Origin: Middle English oistre, from Old French, from Latin ostreum, ostrea, from Greek ostreon; see ost- in Indo-European roots.