perforated eardrum an eardrum with a hole or tear in it; can interfere with normal hearing and cause other ear problems
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Wiktionary
Substantiv
eardrum -
A thin membrane that separates the outer ear from the middle ear and transmits sound from the air to the malleus.
Wikipedia
The tympanic membrane, or eardrum, is a thin membrane that separates the external ear from the middle ear. Its function is to transmit sound from the air to the ossicles inside the middle ear. The malleus bone bridges the gap between the eardrum and the other ossicles.
