Thesaurus: bivalve

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1. n. A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca.
2. n. A pericarp in which the seed case opens or splits into two parts or valves.
3. a. Having two shells or valves which open and shut, as the oyster and certain seed vessels.
4. adj. used of mollusks having two shells (as clams etc.)
5. n. marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
6. 1. (Zoöl.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca. 2. (Bot.) A pericarp in which the seed case opens or splits into two parts or valves. Having two shells or valves which open and shut, as the oyster and certain seed vessels.
7. A mollusk having a shell consisting of two lateral plates orvalves joined together by an elastic ligament at the hinge, which isusually strengthened by prominences called teeth. The shell is closedby the contraction of two transverse muscles attached to the innersurface, as in the clam, -- or by one, as in the oyster. SeeMollusca.
8. n:100 n. marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together a. used of mollusks having two shells (as clams etc.)