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| Tympana | 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] |
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