A mollusk, eg an oyster or a clam, which has a shell consisting of two hinged valves.
Any mollusc of the taxonomic course Bivalvia, described as a shell comprising two hinged parts, including a scallop, clam, mussel or oyster.
A mollusk having a shell comprising two lateral plates or valves joined up with together by an elastic ligament within hinge, which can be typically strengthened by prominences called teeth. The layer is closed because of the contraction of two transverse muscle tissue attached to the inner area, as in the clam, -- or by one, such as the oyster. See Mollusca.
A pericarp when the seed instance opens up or splits into two parts or valves.
plural Folding doors.
In zoology, a headless lamellibranch mollusk whoever shell has actually two hinged valves, which are exposed and closed by proper muscle tissue: opposed to univalve.
In botany, a pericarp when the seed-case opens up or splits into two components.
marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged collectively