Webster's English Dictionary

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tympan

tym.pan \'tim-p*n\ n [in sense 1, fr. ME, fr. OE timpana, fr. L tympanum; 
   in other sense]s, fr. ML & L tympanum 1: DRUM  2: a sheet (as of paper or 
   cloth) placed between the impression surface of  a press and the paper to 
   be printed 3: an architectural panel : TYMPANUM