- a drum consisting of a hollow hemisphere of brass, copper, or fiberglass over which is stretched a skin, the tension of which can be modified by hand screws or foot pedals to vary the pitch.
- a percussion instrument of definite pitch, consisting of a hollow bowl-like hemisphere covered with a skin or membrane, supported on a tripod or stand. The pitch may be adjusted by means of screws or pedals, which alter the tension of the skin
