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.
A medium-sized edible mussel, Mytilus edulis, found on the North Atlantic coast of North America, Europe, and in other temperate and polar waters around the world.