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Rock Shaft :: Rock shaft () A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft..

Loment :: Loment (n.) An elongated pod, consisting, like the legume, of two valves, but divided transversely into small cells, each containing a single seed..

Veliger :: Veliger (n.) Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming.

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

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..

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

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

Cornet-a-piston :: Cornet-a-piston (n.) A brass wind instrument, like the trumpet, furnished with valves moved by small pistons or sliding rods; a cornopean; a cornet..

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..

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

Valve :: Valve (n.) A door; especially, one of a pair of folding doors, or one of the leaves of such a door..

Cephalata :: Cephalata (n. pl.) A large division of Mollusca, including all except the bivalves; -- so called because the head is distinctly developed. See Illustration in Appendix..

Heteromyaria :: Heteromyaria (n. pl.) A division of bivalve shells, including the marine mussels, in which the two adductor muscles are very unequal. See Dreissena, and Illust. under Byssus..

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..

Spat :: Spat (n.) A young oyster or other bivalve mollusk, both before and after it first becomes adherent, or such young, collectively..

Sucker :: Sucker (n.) The embolus, or bucket, of a pump; also, the valve of a pump basket..

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..

Clam :: Clam (v. t.) A bivalve mollusk of many kinds, especially those that are edible; as, the long clam (Mya arenaria), the quahog or round clam (Venus mercenaria), the sea clam or hen clam (Spisula solidissima), and other species of the United States. The name is said to have been given originally to the Tridacna gigas, a huge East Indian bivalve..

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..

Ostracoidea :: Ostracoidea (n. pl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about..

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