Tympanum

(n.) The ear drum, or middle ear. Sometimes applied incorrectly to the tympanic membrane. See Ear.

(n.) A chamber in the anterior part of the syrinx of birds.

(n.) One of the naked, inflatable air sacs on the neck of the prairie chicken and other species of grouse.

(n.) The recessed face of a pediment within the frame made by the upper and lower cornices, being usually a triangular space or table.

(n.) The space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch.

(n.) 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.

编辑:兰尼

• About 1860, Reis built several forms of electrical telephonic apparatus, all imitating in some degree the human ear, with its auditory tube, tympanum, etc. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.

整理:莱昂内尔