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y, one of a pair of folding doors, or one of the leaves of such a door. Swift through the valves the visionary fair Repassed. Pope. Heavily closed, . . . the valves of the barn doors. Longfellow.

Any fresh-water gastropod of the genus Valvata.

Having a valve or valve; valvate.

A little valve; a valvule; especially, one of the pieces which compose the outer covering of a pericarp.

A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyst…

Having two valves, as the oyster and some seed pods; bivalve.

See Snifting valve.

A kind of slide valve. See Slide valve, under Slide.

See under Valve.

Having the valves equal in size and from, as in most bivalve shells.

A suction valve or check valve at the lower end of a pipe; esp., such a valve in a steam-engine condenser opening to the air pump.

Having unequal valves, as the shell of an oyster.

A conical valve, opening outward, to close the mouth of a pipe which passes through the side of a vessel below the water line.

Any mollusk which has a shell composed of more than two pieces.

Having many valves.

A small hand-operated valve to admit liquid to operate a valve difficult to turn by hand.

Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp.

Having five valves, as a pericarp.

A valve permitting a fluid under pressure an easier avenue of escape than normally; specif., a valve, actuated by the governor, used in one system of marine-engine governing to connect both ends of the low-pressure cylinder as a supplementary control.

Consisting of, or having, three valves; opening with three valves; as, a three-valved pericarp.