"tympanum" in the noun sense
1. middle ear, tympanic cavity, tympanum
the main cavity of the ear between the eardrum and the inner ear
2. eardrum, tympanum, tympanic membrane, myringa
the membrane in the ear that vibrates to sound
3. kettle, kettledrum, tympanum, tympani, timpani
a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it
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