any clever maneuver | one of the paired hinged shells of certain molluscs and of brachiopods |
an instrumentality invented for a particular purpose | the entire one-piece shell of a snail and certain other molluscs |
an emblematic design (especially in heraldry) | control consisting of a mechanical device for controlling the flow of a fluid |
any ornamental pattern or design (as in embroidery) | device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone |
something in an artistic work designed to achieve a particular effect | a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it |