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Beard :: Beard (n.) The gills of some bivalves, as the oyster..

Univalve :: Univalve (n.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs..

Malacobdella :: Malacobdella (n.) A genus of nemertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha..

Fang :: Fang (v. t.) The valve of a pump box.

Quadrivalve :: Quadrivalve (a.) Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp..

Siphonata :: Siphonata (n. pl.) A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug..

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..

Trough-shell :: Trough-shell (n.) Any bivalve shell of the genus Mactra. See Mactra.

Valve :: Valve (n.) One of the pieces or divisions of bivalve or multivalve shells.

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..

Oyster :: Oyster (n.) Any marine bivalve mollusk of the genus Ostrea. They are usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers. The common European oyster (Ostrea edulis), and the American oyster (Ostrea Virginiana), are the most important species..

Valvelet :: Valvelet (n.) A little valve; a valvule; especially, one of the pieces which compose the outer covering of a pericarp..

Rudistes :: Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

Frustule :: Frustule (n.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover..

Tricuspid :: Tricuspid (a.) Of or pertaining to the tricuspid valves; as, tricuspid obstruction..

Inequivalve :: Inequivalve (a.) Alt. of Inequivalvula.

Brachiopoda :: Brachiopoda (n.) A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle..

Anodon :: Anodon (n.) A genus of fresh-water bivalves, having no teeth at the hinge..

Stopcock :: Stopcock (n.) A bib, faucet, or short pipe, fitted with a turning stopper or plug for permitting or restraining the flow of a liquid or gas; a cock or valve for checking or regulating the flow of water, gas, etc., through or from a pipe, etc..

Pulsometer :: Pulsometer (n.) A device, with valves, for raising water by steam, partly by atmospheric pressure, and partly by the direct action of the steam on the water, without the intervention of a piston; -- also called vacuum pump..

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