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The Collaborative International Dictionary of English v.0.48 (gcide)

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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