A kettledrum.Licensed from iStockPhoto
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kettledrum - Cultural Definition
A drum consisting of a skin stretched over a large shell in the shape of a half-sphere. The pitch of the kettledrum can be changed by manipulating screws at the edge of the skin or pedals at the bottom of the drum. Kettledrums are usually used in classical music in sets of two or more and are known by their Italian name, timpani.