鼓こ室しつこしつMeanings1nountympanic cavityanatomyAnatomical term for the middle ear cavity. Used in medical contexts.鼓こ室しつは中ちゅう耳じの一いち部ぶで、耳じ小しょう骨こつが含ふくまれている。The tympanic cavity is part of the middle ear and contains the auditory ossicles.