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n A device that controls the flow of a gas or fluid through a pipe.

n A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.

n (anatomy) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves.

n (British) A vacuum tube.

n (botany) One of the pieces into which certain fruits naturally separate when they dehisce.

n (botany) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.

n (biology) One of the pieces or divisions of bivalve or multivalve shells.

n (biology) One of the two similar portions of the shell of a diatom.

v (transitive) To control (flow) by means of a valve.