tympan

Etymology
From.

Noun

 * 1)  A piece of cloth padding placed under the platen of a letterpress to distribute the pressure on the sheet being printed.
 * 2)  The stretched membrane of a drum.
 * 3)  A percussion instrument consisting of a hollow cylinder with such a membrane at each end.
 * 4)  A tympanum.
 * 5) The tympanum of the ear.
 * 1) The tympanum of the ear.

Etymology
., which was inherited.

Noun

 * 1)  eardrum
 * 2)  middle ear
 * 3)  tympanum
 * 4)  treadwheel, treadmill
 * 5)  hydraulic wheel
 * 6)  various percussion instruments, such as gongs, tympans, tambourines, etc.