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Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Astarte :: Astarte (n.) A genus of bivalve mollusks, common on the coasts of America and Europe..

Veneracea :: Veneracea (n. pl.) An extensive tribe of bivalve mollusks of which the genus Venus is the type. The shells are usually oval, or somewhat heartshaped, with a conspicuous lunule. See Venus..

Lap :: Lap (n.) The amount by which a slide valve at its half stroke overlaps a port in the seat, being equal to the distance the valve must move from its mid stroke position in order to begin to open the port. Used alone, lap refers to outside lap. See Outside lap (below)..

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

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

Saxhorn :: Saxhorn (n.) A name given to a numerous family of brass wind instruments with valves, invented by Antoine Joseph Adolphe Sax (known as Adolphe Sax), of Belgium and Paris, and much used in military bands and in orchestras..

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

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

Pallial :: Pallial (a.) Of or pretaining to a mantle, especially to the mantle of mollusks; produced by the mantle; as, the pallial line, or impression, which marks the attachment of the mantle on the inner surface of a bivalve shell. See Illust. of Bivalve..

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..

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

Sea Clam :: Sea clam () Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridae, as the common American species. (Mactra, / Spisula, solidissima); -- called also beach clam, and surf clam..

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

Valve :: Valve (n.) A lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid..

Handwheel :: Handwheel (n.) Any wheel worked by hand; esp., one the rim of which serves as the handle by which a valve, car brake, or other part is adjusted..

Saxicava :: Saxicava (n.) Any species of marine bivalve shells of the genus Saxicava. Some of the species are noted for their power of boring holes in limestone and similar rocks.

Lag :: Lag (n.) The amount of retardation of anything, as of a valve in a steam engine, in opening or closing..

Slide :: Slide (n.) A slide valve.

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