Any mollusc belonging to the taxonomic class Bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster.
A pericarp in which the seed case opens or splits into two parts or valves.
any marine or freshwater bivalve mollusk, of the class Lamellibranchia or Bivalvia; includes the clams, scallops and oysters