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Tympanum
/tˈɪmpænəm/
/ˈtɪmpənəm/
Tympanum
[NOUN]1
a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it
3
the main cavity of the ear; between the eardrum and the inner ear
4
the semi-circular or triangular space enclosed by the lintel and arch above a doorway, often decorated with sculptural reliefs or intricate designs