VALVE

• (noun) one of the paired hinged shells of certain molluscs and of brachiopods

• (noun) the entire one-piece shell of a snail and certain other molluscs

• (noun) control consisting of a mechanical device for controlling the flow of a fluid

• (noun) device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone

• (noun) a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

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