Etymology
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tympanum (n.)

"drum of the ear," 1610s, from Medieval Latin tympanum, introduced in this sense by Italian anatomist Gabriello Fallopio (1523-1562), from Latin tympanum "a drum, timbrel, tambourine," from Greek tympanon "a kettledrum," from root of typtein "to beat, strike" (see type (n.)). Compare Old English timpan "drum, timbrel, tambourine," from Latin tympanum. The modern meaning "a drum" is attested in English from 1670s.

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Definitions of tympanum

tympanum (n.)
the main cavity of the ear; between the eardrum and the inner ear;
Synonyms: middle ear / tympanic cavity
tympanum (n.)
the membrane in the ear that vibrates to sound;
Synonyms: eardrum / tympanic membrane / myringa
tympanum (n.)
a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it;
Synonyms: kettle / kettledrum / tympani / timpani
From wordnet.princeton.edu