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Anything having three valves, especially a shell.

A shell or tube formed by an annelid, as a serpula.

A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.

Having one valve; as, a univalve shell or pericarp.

A univalve mollusk of the genus Haliotis. The shell is lined with mother-of-pearl, and used for ornamental purposes; the sea-ear. Several large species are found on the coast of California, clinging closely to the rocks.

That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

Without a distinct head; -- a term applied to bivalve mollusks.

he impulse of the player's finger is transmitted to the strings of a pianoforte or to the valve of an organ pipe. Grove. Chose in action. (Law) See Chose. -- Quantity of action (Physics), the product of the mass of a body by the space it runs through, and its velocity.

d to abductor; as, the adductor of the eye, which turns the eye toward the nose. In the bivalve shells, the muscles which close the values of the shell are called adductor muscles. Verrill.

peech. It consists of a phonograph diaphragm so arranged that its action opens and closes valves, producing synchronous air blasts sufficient to operate a larger diaphragm with greater amplitude of vibration.

ressed into a reservoir attached to the gun, by a condensing pump, and is controlled by a valve actuated by the trigger.

The exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell.

A genus of fresh-water bivalves, having to teeth at the hinge. [Written also Anodonta.]

A genus of bivalve shells, allied to the oyster, so called from their unequal valves, of which the lower is perforated for attachment.

A marine bivalve shell belonging to the genus Arca and its allies.

Destitute of a siphon or breathing tube; -- said of many bivalve shells. -- n.

A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.

A genus of bivalve mollusks, common on the coasts of America and Europe.

auricled. (b) (Zoöl.) Having an angular projection on one or both sides, as in certain bivalve shells, the foot of some gastropods, etc. Auriculate leaf, one having small appended leaves or lobes on each side of its petiole or base.

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.