tympanoeustachian

tym·pa·no·eu·sta·chian

(tim'pă-nō-yū-stā'shŭn, -stā'kē-an),
Relating to the tympanic cavity and the auditory tube.

tympanoeustachian

(tĭm″pă-nō-ū-stā′kē-ăn)
Concerning the tympanic cavity and eustachian tube.