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ugh a buttonhole, as in buttoning boots and gloves. -- Button shell (Zoöl.), a small, univalve marine shell of the genus Rotella. -- Button snakeroot. (Bot.) (a) The American composite genus Liatris, having rounded buttonlike heads of flowers. (b) An American umbelliferous plant with rigid, narrow leaves, and flowers…

ong, tough filaments which are formed in a groove of the foot, and issue from between the valves of certain bivalve mollusks, as the Pinna and Mytilus, by which they attach themselves to rocks, etc.

A skeleton frame to limit the motion of a loose piece, as a ball valve.

engine piston, the supply of gasoline being regulated by a float which actuates a needle valve controlling the outlet of the feed pipe. Alcohol and other volatile inflammable liquids may be used instead of gasoline.

) Aries, Lidra, Cancer, and Capricorn. -- Cardinal teeth (Zoöl.), the central teeth of bivalve shell. See Bivalve. -- Cardinal veins (Anat.), the veins in vertebrate embryos, which run each side of the vertebral column and returm the blood to the heart. They remain through life in some fishes. -- Cardinal virtues, p…

The hinge of a bivalve shell.

ed to convey letters from a distant point to to its home. -- Carrier shell (Zoöl.), a univalve shell of the genus Phorus; -- so called because it fastens bits of stones and broken shells to its own shell, to such an extent as almost to conceal it. -- Common carrier (Law.) See under Common, a.

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

ch.), a secondary nut, screwing down upon the primary nut to secure it. Knight. -- Check valve (Mech.), a valve in the feed pipe of a boiler to prevent the return of the feed water. -- To take check, to take offense. [Obs.] Dryden.

A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.

Anything that causes a clacking noise, as the clapper of a mill, or a clack valve.

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 Indi…

learance space (Steam engine), the space inclosed in one end of the cylinder, between the valve or valves and the piston, at the beginning of a stroke; waste room. It includes the space caused by the piston's clearance and the space in ports, passageways, etc. Its volume is often expressed as a certain proportion of th…

A faucet or valve.

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.

One of the shells or valves of a cockle.

The upright pillar in the axis of most univalve shells.

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.

That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.

Shaped like one half of a bivalve shell; shell-shaped.