Bivalve
Part of speech: noun
Definition: 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.
Univalve
Part of speech: adjective
Definition: having one valve, typically used to refer to mollusks.consisting of a single valve or piece, used to refer to a shell.
Part of speech: noun
Definition: A univalve mollusk or its shell.