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tympanum
nounDefinition of tympanum
1a(1)
: tympanic membrane
(2)
: middle ear
b
: a thin tense membrane covering an organ of hearing of an insect — see insect illustration
c
: a membranous resonator in a sound-producing organ
2a
: the recessed usually triangular face of a pediment within the frame made by the upper and lower cornices
b
: the space within an arch and above a lintel or a subordinate arch
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