mollusc, mollusk, shellfish - invertebrate having a soft unsegmented body usually enclosed in a shell

Bivalvia, class Bivalvia, class Lamellibranchia, class Pelecypoda, Lamellibranchia - oysters; clams; scallops; mussels

clam - burrowing marine mollusk living on sand or mud

cockle - common edible European bivalve mollusk having a rounded shell with radiating ribs

oyster - marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters

ark shell - marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface

blood clam - red-blooded clam

mussel - marine or freshwater bivalve mollusk that lives attached to rocks etc.

escallop, scollop, scallop - edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions

piddock - marine bivalve that bores into rock or clay or wood by means of saw-like shells

bivalve, bivalved - used of mollusks having two shells (as clams etc.)