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

Bimuscular :: Bimuscular (a.) Having two adductor muscles, as a bivalve mollusk..

Asiphonida :: Asiphonida (n. pl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks..

Escalop :: Escalop (n.) A bivalve shell of the genus Pecten. See Scallop.

Bucket :: Bucket (n.) The valved piston of a lifting pump.

Lunule :: Lunule (n.) A special area in front of the beak of many bivalve shells. It sometimes has the shape of a double crescent, but is oftener heart-shaped. See Illust. of Bivalve..

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

Hydrant :: Hydrant (n.) A discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks; a water plug.

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

Sea Cock :: Sea cock () In a steamship, a cock or valve close to the vessel's side, for closing a pipe which communicates with the sea..

Box :: Box (n.) A chamber or section of tube in which a valve works; the bucket of a lifting pump.

Summitless :: Summit (n.) The most elevated part of a bivalve shell, or the part in which the hinge is situated..

Cover :: Cover (n.) The lap of a slide valve.

Lithodome :: Lithodome (n.) Any one of several species of bivalves, which form holes in limestone, in which they live; esp., any species of the genus Lithodomus..

Escutcheon :: Escutcheon (n.) The depression behind the beak of certain bivalves; the ligamental area.

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

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

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

Conchoidal :: Conchoidal (a.) Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

Regulator :: Regulator (n.) A contrivance for regulating and controlling motion, as: (a) The lever or index in a watch, which controls the effective length of the hairspring, and thus regulates the vibrations of the balance. (b) The governor of a steam engine. (c) A valve for controlling the admission of steam to the steam chest, in a locomotive..

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