
n., pl., -na, also -na (-nə), or -nums, also -nums.
- Anatomy. See middle ear.
- See eardrum.
- Zoology. A membranous external auditory structure, as in certain insects.
- Architecture.
- The ornamental recessed space or panel enclosed by the cornices of a triangular pediment.
- A similar space between an arch and the lintel of a portal or window.
- The diaphragm of a telephone.
[Medieval Latin, from Latin, drum, from Greek tumpanon.]










