eardrum - definition of eardrum by the Free Online Dictionary, Thesaurus and Encyclopedia.
ear·drum (îr dr m) n. The thin, semitransparent, oval-shaped membrane that separates the middle ear from the external ear. Also called tympanic membrane, tympanum. ear•drum (ˈɪərˌdrʌm) n. a membrane in the ear canal between the external ear and the middle...
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