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Lyopomata :: Lyopomata (n. pl.) An order of brachiopods, in which the valves of shell are not articulated by a hinge. It includes the Lingula, Discina, and allied forms..

Xylotrya :: Xylotrya (n.) A genus of marine bivalves closely allied to Teredo, and equally destructive to timber. One species (Xylotrya fimbriata) is very common on the Atlantic coast of the United States..

Cockle :: Cockle (n.) A bivalve mollusk, with radiating ribs, of the genus Cardium, especially C. edule, used in Europe for food; -- sometimes applied to similar shells of other genera..

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..

Retinaculum :: Retinaculum (n.) A connecting band; a fraenum; as, the retinacula of the ileocaecal and ileocolic valves..

Conchiform :: Conchiform (a.) Shaped like one half of a bivalve shell; shell-shaped.

Labrum :: Labrum (n.) The external margin of the aperture of a shell. See Univalve.

Lead :: Lead (n.) The width of port opening which is uncovered by the valve, for the admission or release of steam, at the instant when the piston is at end of its stroke..

Helicoid :: Helicoid (a.) Spiral; curved, like the spire of a univalve shell..

Intracolic :: Intracolic (a.) Within the colon; as, the intracolic valve..

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

Ileocolic :: Ileocolic (a.) Pertaining to the ileum and colon; as, the ileocolic, or ileocaecal, valve, a valve where the ileum opens into the large intestine..

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..

Throttle :: Throttle (n.) The throttle valve.

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..

Valvula :: Valvula (n.) A little valve or fold; a valvelet; a valvule.

Ark Shell :: Ark shell () A marine bivalve shell belonging to the genus Arca and its allies.

Quinquevalve :: Quinquevalve (a.) Alt. of Quinquevalvula.

Solenacean :: Solenacean (n.) Any species of marine bivalve shells belonging to the family Solenidae.

Throw :: Throw (n.) The extreme movement given to a sliding or vibrating reciprocating piece by a cam, crank, eccentric, or the like; travel; stroke; as, the throw of a slide valve. Also, frequently, the length of the radius of a crank, or the eccentricity of an eccentric; as, the throw of the crank of a steam engine is equal to half the stroke of the piston..

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