- Tympanums
- Tympanum Tym"pa*num, n.; pl. E. {Tympanums}, L. {Tympana}.
[L., a kettledrum, a drum or wheel in machines, the
triangular area in a pediment, the panel of a door, Gr. ?, ?,
fr. ? to strike, beat. See {Type}, and cf. {Timbrel}.]
1. (Anat.)
(a) The ear drum, or middle ear. Sometimes applied
incorrectly to the tympanic membrane. See {Ear}.
(b) A chamber in the anterior part of the syrinx of birds.
[1913 Webster]
2. (Zo["o]l.) One of the naked, inflatable air sacs on the neck of the prairie chicken and other species of grouse. [1913 Webster]
3. (Arch.) (a) The recessed face of a pediment within the frame made by the upper and lower cornices, being usually a triangular space or table. (b) The space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch. [1913 Webster]
4. (Mech.) 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, -- used for raising water, as for irrigation. [1913 Webster]
The Collaborative International Dictionary of English. 2000.