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tympanum

tym·pa·num [ tímpənəm ] (plural tym·pa·nums or tym·pa·na [ tímpənə ])


noun 
Definition:
 
1. architecture recessed space: a recess, especially the recessed space between the top of a door or window and the arch above it, or between the cornices forming a classical triangular gable pediment

2. anatomy ear part: the eardrum or the cavity of the middle ear ( technical )

3. insects insect organ: a vibrating membrane in some insects that serves as a hearing organ

4. acoustics 
Same as  tympan (sense 3)


[Early 16th century. Via Latin< Greek tumpanon "drum"]
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