tym·pan /ˈtɪmpən/
 鼓膜;鼓皮;壓格紙
 Tym·pan n.
 1. A drum. [Obs.]
 2. Arch. A panel; a tympanum.
 3. Print. A frame covered with parchment or cloth, on which the blank sheets are put, in order to be laid on the form to be impressed.
 Tympan sheet Print., a sheet of paper of the same size as that to be printed, pasted on the tympan, and serving as a guide in laying the sheets evenly for printing.
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 tympan
      n : a musical percussion instrument; usually consists of a
          hollow cylinder with a membrane stretch across each end
          [syn: drum, membranophone]