Definitions from Wiktionary ( )

▸ noun:  A device that controls the flow of a gas or fluid through a pipe.
▸ noun:  A device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
▸ noun:  (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 control the flow in the opposite direction
▸ noun:  One of the leaves of a folding-door, or a window-sash.
▸ noun:  (British) A vacuum tube.
▸ noun:  (botany) One of the pieces into which certain fruits naturally separate when they dehisce.
▸ noun:  (botany) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, such as in the barberry.
▸ noun:  (biology) One of the pieces or divisions of bivalve or multivalve shells.
▸ noun:  (biology) One of the two similar portions of the shell of a diatom.
▸ verb:  (transitive) To control (flow) by means of a valve.






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