Ear-drum.
The membrane in the ear that vibrates to sound; SYN. tympanum, tympanic membrane.

Another name for the eardrum.
A thin membrane that closes externally the cavity of the middle ear and functions in the mechanical reception of sound waves and in their transmission to the site of sensory reception.

ETYM Latin, a kettledrum, a drum or wheel in machines, the triangular area in a pediment, the panel of a door.
(Irregular plural: tympanums, or: tympana).
1. The ear drum, or middle ear. Sometimes applied incorrectly to the tympanic membrane.
2. A chamber in the anterior part of the syrinx of birds.
3. The recessed face of a pediment within the frame made by the upper and lower cornices, being usually a triangular space or table.
4. The space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch.
5. A drum-shaped wheel with spirally curved partitions by which water is raised to the axis when the wheel revolves with the lower part of the circumference submerged.
Space within an arch; arched recess at entrance of cathedral.
Ear-drum; Archtitecture, triangular face of pediment; space within arch. + prikaži više