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tympanum

tym·pa·num (tim·pa·num)

tympanum (timpanum)

pronunciation:
tIm p nm
part of speech: noun
inflections: tympana, tympanums
definition 1: the middle ear.
definition 2: the eardrum; tympanic membrane.
definition 3: a membrane in some insects that is analogous to the eardrum.
definition 4: a diaphragm in a telephone.