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Inequivalvular :: Inequivalvular (a.) Having unequal valves, as the shell of an oyster..

Avicula :: Avicula (n.) A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; -- so called from a supposed resemblance of the typical species to a bird..

Cut-off :: Cut-off (n.) The valve gearing or mechanism by which steam is cut off from entering the cylinder of a steam engine after a definite point in a stroke, so as to allow the remainder of the stroke to be made by the expansive force of the steam already let in. See Expansion gear, under Expansion..

Travel :: Travel (n.) The length of stroke of a reciprocating piece; as, the travel of a slide valve..

Trivalve :: Trivalve (n.) Anything having three valves, especially a shell..

Valvate :: Valvate (a.) Resembling, or serving as, a valve; consisting of, or opening by, a valve or valves; valvular..

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

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..

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

Plate-gilled :: Plate-gilled (a.) Having flat, or leaflike, gills, as the bivalve mollusks..

Borer :: Borer (n.) Any bivalve mollusk (Saxicava, Lithodomus, etc.) which bores into limestone and similar substances..

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..

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..

Terebratula :: Terebratula (n.) A genus of brachiopods which includes many living and some fossil species. The larger valve has a perforated beak, through which projects a short peduncle for attachment. Called also lamp shell..

Legume :: Legume (n.) A pod dehiscent into two pieces or valves, and having the seed attached at one suture, as that of the pea..

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..

Trimyarian :: Trimyarian (n.) A lamellibranch which has three muscular scars on each valve.

Mitral :: Mitral (a.) Pertaining to a miter; resembling a miter; as, the mitral valve between the left auricle and left ventricle of the heart..

Dolium :: Dolium (n.) A genus of large univalve mollusks, including the partridge shell and tun shells..

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