Originally posted by mercia
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There are so many definitions, but a common area of meaning seems to be a hollow, cavity or space. If the earliest meaning was referring to anything hollow like this, struck to make a noise, later meanings (ear drum, architectural feature, zoological) perhaps took up the various physical attributes of the 'drum' without necessarily having anything to do with striking.
A tympanum, of a medieval cathedral, for example, refers to the 'empty space' above the door itself but below the arch (of whatever shape) which was usually then filled with carvings.
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