Relating to the inner structures of the tympanum or eardrum.
From Greek 'entos' (inside) and 'tympanon' (drum). This anatomical adjective describes the internal features of the ear's drum-like membrane.
Your eardrum has an 'entotympanic' side—the surface facing inward toward your middle ear—and it's the side that actually vibrates to send sound deeper into your hearing system.
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