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Valve :: Valve (n.) A lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid..

Pandora :: Pandora (n.) A genus of marine bivalves, in which one valve is flat, the other convex..

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

Mytilus :: Mytilus (n.) A genus of marine bivalve shells, including the common mussel. See Illust. under Byssus..

Lithodomus :: Lithodomus (n.) A genus of elongated bivalve shells, allied to the mussels, and remarkable for their ability to bore holes for shelter, in solid limestone, shells, etc. Called also Lithophagus..

Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Gearing :: Gearing (n.) The parts by which motion imparted to one portion of an engine or machine is transmitted to another, considered collectively; as, the valve gearing of locomotive engine; belt gearing; esp., a train of wheels for transmitting and varying motion in machinery..

Shipworm :: Shipworm (n.) Any long, slender, worm-shaped bivalve mollusk of Teredo and allied genera. The shipworms burrow in wood, and are destructive to wooden ships, piles of wharves, etc. See Teredo..

Univalve :: Univalve (a.) Alt. of Univalve.

Kingston Valve :: Kingston valve () A conical valve, opening outward, to close the mouth of a pipe which passes through the side of a vessel below the water line..

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..

Bivalve :: Bivalve (n.) A pericarp in which the seed case opens or splits into two parts or valves.

Ostracean :: Ostracean (n.) Any one of a family of bivalves, of which the oyster is the type..

Multivalvular :: Multivalvular (a.) Having many valves.

Organ :: Organ (n.) A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine..

Bear''s-paw :: Bear's-paw (n.) A large bivalve shell of the East Indies (Hippopus maculatus), often used as an ornament..

Conch :: Conch (n.) A name applied to various marine univalve shells; esp. to those of the genus Strombus, which are of large size. S. gigas is the large pink West Indian conch. The large king, queen, and cameo conchs are of the genus Cassis. See Cameo..

Lip :: Lip (n.) One of the edges of the aperture of a univalve shell.

Mollusca :: Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

Unimuscular :: Unimuscular (a.) Having only one adductor muscle, and one muscular impression on each valve, as the oyster; monomyarian..

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