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tympana tympanum的復數形式 tympanum的復數形式 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. ty` mpanon, ty` panon, 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. ( Zool.) 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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