bivalve


1bi·valve

adjective \ˈbī-ˌvalv\

Definition of BIVALVE

:  being or having a shell composed of two valves

First Known Use of BIVALVE

1661

Rhymes with BIVALVE

2bivalve

noun

biology : a sea animal that has a shell with two movable parts connected by a hinge

Full Definition of BIVALVE

:  any of a class (Bivalvia syn. Pelecypoda) of typically marine mollusks (as clams, oysters, or scallops) that have a 2-valved hinged shell, are usually filter feeders, and lack a distinct head

Examples of BIVALVE

  1. clams, mussels, oysters, and other bivalves

First Known Use of BIVALVE

1683

bivalve

noun    (Concise Encyclopedia)

Internal structure of a clam. A ligament hinges the shell's two halves (valves) open, and the …—© Merriam-Webster Inc.

Any member of the mollusk class Bivalvia, or Pelecypoda, characterized by having a two-halved (valved) shell. Clams, cockles, mussels, oysters, scallops, and shipworms are bivalves. Most are completely enclosed by the shell, the two valves of which are joined by an elastic ligament, and by two sheets of tissue called the mantle. Bivalves have no head. They feed on phytoplankton by pumping water across the gills and trapping food particles that are then moved to the mouth. Bivalves are found in most parts of the ocean from the intertidal zone to abyssal depths.

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