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Mya :: Mya (n.) A genus of bivalve mollusks, including the common long, or soft-shelled, clam..

Three-valved :: Three-valved (a.) Consisting of, or having, three valves; opening with three valves; as, a three-valved pericarp..

Integropallial :: Integropallial (a.) Having the pallial line entire, or without a sinus, as certain bivalve shells..

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..

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

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..

Valved :: Valved (a.) Having a valve or valve; valvate.

Multivalvular :: Multivalvular (a.) Many-valved; having more than two valves; -- said of certain shells, as the chitons..

Pearl :: Pearl (n.) A shelly concretion, usually rounded, and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or mother-of-pearl. Pearls which are round, or nearly round, and of fine luster, are highly esteemed

Drill :: Drill (n.) A marine gastropod, of several species, which kills oysters and other bivalves by drilling holes through the shell. The most destructive kind is Urosalpinx cinerea..

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

Blow Valve :: Blow valve () See Snifting valve.

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..

Septiferous :: Septiferous (a.) Bearing a partition; -- said of the valves of a capsule.

Melon :: Melon (n.) A large, ornamental, marine, univalve shell of the genus Melo..

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

Eye :: Eye (n.) The scar to which the adductor muscle is attached in oysters and other bivalve shells; also, the adductor muscle itself, esp. when used as food, as in the scallop..

Clack :: Clack (v. t.) Anything that causes a clacking noise, as the clapper of a mill, or a clack valve..

Port :: Port (n.) A passageway in a machine, through which a fluid, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face..

Condenser :: Condenser (n.) An instrument for condensing air or other elastic fluids, consisting of a cylinder having a movable piston to force the air into a receiver, and a valve to prevent its escape..

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