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• TYMPANUM (noun) The noun TYMPANUM has 3 senses: 1. the main cavity of the ear; between the eardrum and the inner ear 2. the membrane in the ear that vibrates to sound 3. a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it Familiarity information: TYMPANUM used as a noun is uncommon.
