Definitions for "Bivalves"
Keywords:  mussels, clam, oyster, mollusc, mollusk
An animal (such as a clam) that has a two-valved shell where both valves are the same size and shape. Also called Pelecypods.
A large group (class) of marine and freshwater molluscs with a shell in two parts hinged together (eg. mussels, clams, oysters).
a general term for two-shelled marine animals, a mollusc. Present day examples include cockles, mussels and oysters.
Encyclopaedia Britannica 2002