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Acephalous :: Acephalous (a.) Without a distinct head; -- a term applied to bivalve mollusks.

Tubivalve :: Tubivalve (n.) A shell or tube formed by an annelid, as a serpula..

Lag :: Lag (n.) The amount of retardation of anything, as of a valve in a steam engine, in opening or closing..

Sea Clam :: Sea clam () Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridae, as the common American species. (Mactra, / Spisula, solidissima); -- called also beach clam, and surf clam..

Borer :: Borer (n.) Any bivalve mollusk (Saxicava, Lithodomus, etc.) which bores into limestone and similar substances..

Pinna :: Pinna (n.) Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity..

Multivalve :: Multivalve (a.) Alt. of Multivalvula.

Xylophaga :: Xylophaga (n.) A genus of marine bivalves which bore holes in wood. They are allied to Pholas.

Valve :: Valve (n.) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry..

Myaria :: Myaria (n. pl.) A division of bivalve mollusks of which the common clam (Mya) is the type.

Dashpot :: Dashpot (n.) A pneumatic or hydraulic cushion for a falling weight, as in the valve gear of a steam engine, to prevent shock..

Valve :: Valve (n.) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves..

Avicula :: Avicula (n.) A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; -- so called from a supposed resemblance of the typical species to a bird..

Tellina :: Tellina (n.) A genus of marine bivalve mollusks having thin, delicate, and often handsomely colored shells..

Hippurite :: Hippurite (n.) A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks..

Decollated :: Decollated (a.) Decapitated; worn or cast off in the process of growth, as the apex of certain univalve shells..

Bivalve :: Bivalve (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..

Holostomatous :: Holostomatous (a.) Having an entire aperture; -- said of many univalve shells.

Ostrea :: Ostrea (n.) A genus of bivalve Mollusca which includes the true oysters.

Venus :: Venus (n.) Any one of numerous species of marine bivalve shells of the genus Venus or family Veneridae. Many of these shells are large, and ornamented with beautiful frills; others are smooth, glossy, and handsomely colored. Some of the larger species, as the round clam, or quahog, are valued for food..

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