Definition of tympanum noun from the Oxford Advanced American Dictionary

 

tympanum

 noun
noun
NAmE//ˈtɪmpənəm//
 
(pl. tympanums or tympana
NAmE//ˈtɪmpənə//
 
)
(anatomy)
 
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the eardrum
See the Oxford Advanced Learner's Dictionary entry: tympanum