tympanic membrane, tympanum
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tympanic membrane, tympanumor
eardruma membrane situated at the end of the external auditory meatus at the junction of the outer and middle ear. Vibrations are set up in the membrane by sound waves and these are transmitted by the ear ossicles to the oval window.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005