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middle ear the central part of the ear, consisting of the eardrum or tympanic membrane and a cavity containing three small bones.
outer ear the part of the ear that is visible outside of the head and which includes the auricle and the canal leading to the eardrum.
tympanic bone in a mammal's skull, a small bone that supports the eardrum and partially encloses the middle ear.
tympanic membrane a thin, oval-shaped membrane separating the middle ear from the external ear, which vibrates when struck by sound waves; eardrum.
tympanum the eardrum; tympanic membrane. [2/4 definitions]