• noun an invertebrate animal with a soft body, a muscular foot on the underside used for movement and, in many species, a protective shell


  • The general term for a creature with a soft body and a hard either external or internal shell, but which is not segmented. Many molluscs live in the sea. Molluscs are divided into univalves (gastropods) with a single solid external shell, bivalves which have a hinged two part external shell and the cephalopods, some of which have an internal shell.