bivalve

noun

• an aquatic mollusc which has a compressed body enclosed within a hinged shell, such as oysters, mussels, and scallops. Also called pelecypod or lamellibranch.

  • Class Bivalvia (formerly Pelecypoda or Lamellibranchia)

adjective

• 1(of a mollusc or other aquatic invertebrate) having a hinged double shell.

• 2 Botany having two valves.