Definition of kettledrum noun from the Oxford Advanced Learner's Dictionary

 

kettledrum

 noun
noun
BrE BrE//ˈketldrʌm//
 
; NAmE NAmE//ˈketldrʌm//
 
 
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a large metal drum with a round bottom and a thin plastic top that can be made looser or tighter to produce different musical notes. A set of kettledrums is usually called timpani.
See the Oxford Advanced American Dictionary entry: kettledrum