Dictionary  tym•pa•numPronunciation: (tim'pu-num), [key] —n., —pl. -nums, -naPronunciation: (-nu). [key] 1. Anat., Zool. a. See middle ear. b. See tympanic membrane. 2. Archit. a. the recessed, usually triangular space enclosed between the horizontal and sloping cornices of a pediment, often decorated with sculpture. b. a similar space between an arch and the horizontal head of a door or window below. 3. Elect.the diaphragm of a telephone. 4. a drum or similar instrument. 5. the stretched membrane forming a drumhead. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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