名詞 tympanum:

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