Looking for the meaning or definition of the word oyster? Here's what it means.
Noun
Any of certain marine bivalvemollusks, especially those of the family Ostreidae (the true oysters), usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers.
The delicate morsel of dark meat contained in a small cavity of the bone on each side of the lower part of the back of a fowl.
A pale beige color tinted with grey or pink, like that of an oyster.
(colloquial, by analogy) A person who keeps secrets.