noun pl. tympanums -·nums or tympana -·na (-nə)

1. Anat.
   1. middle ear
   2. tympanic membrane
2. Zool.
   1. a drumlike structure serving as a vibratory membrane for the hearing organs of certain insects
   2. the resonating chamber of the syrinx in birds
3. a drum or drumhead
4. Archit.
   1. the recessed space, usually triangular, enclosed by the slanting cornices of a pediment, often ornamented with sculpture
   2. a corresponding semicircular space enclosed by an arch and the top of the door or window below it
5. Elec. the diaphragm of a telephone

Etymology: L: see tympan