Definitions
1.nounA device that controls the flow of a gas or fluid through a pipe.
2.nounA device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
3.nounOne 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 control the flow in the opposite direction"the ileocolic, mitral, and semilunar valves"
4.nounOne of the leaves of a folding-door, or a window-sash.
5.nounA vacuum tube.
6.nounOne of the pieces into which certain fruits naturally separate when they dehisce.
7.nounA small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, such as in the barberry.
8.nounOne of the pieces or divisions of bivalve or multivalve shells.
9.nounOne of the two similar portions of the shell of a diatom.
10.verbTo control (flow) by means of a valve.