1. • noun - a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
   • noun - device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
   • noun - control consisting of a mechanical device for controlling the flow of a fluid
   • noun - the entire one-piece shell of a snail and certain other molluscs
   • noun - one of the paired hinged shells of certain molluscs and of brachiopods
2. • A membranous structure in a hollow organ or passage, as in an artery or a vein, that folds or closes to prevent the return flow of the body fluid passing through it.
   • Any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways.
   • The movable control element of such a device.
   • A device in a brass wind instrument that permits change in pitch by a rapid varying of the air column in a tube.
   • Biology.
   • One of the paired, hinged shells of certain mollusks and of brachiopods.
   • One of the two silicified halves of the cell wall of a diatom.
   • The entire, one-piece shell of a snail and certain other mollusks.
   • Botany.
   • One of the sections into which the wall of a seedpod or other dehiscent fruit splits.
   • A lidlike covering of an anther.
   • An electron tube or a vacuum tube.
   • Archaic.
   • To provide with a valve.
   • To control by means of a valve.
3. • v - to provide with a valve (a device for controlling the flow of a liquid or gas)

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