- 1. n a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it n device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone n control consisting of a mechanical device for controlling the flow of a fluid n the entire one-piece shell of a snail and certain other molluscs n one of the paired hinged shells of certain molluscs and of brachiopods Source: ecdict
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