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

 

tympanum

 noun
noun
BrE BrE//ˈtɪmpənəm//
 
; NAmE NAmE//ˈtɪmpənəm//
 
(pl. tympanums, tympana
BrE BrE//ˈtɪmpənə//
 
; NAmE NAmE//ˈtɪmpənə//
 
)
(anatomy)
 
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the eardrum Word Origin early 17th cent.: via Latin from Greek tumpanon ‘drum’, based on tuptein ‘to strike’.
See the Oxford Advanced American Dictionary entry: tympanum