Tym"pan (?), n. [F., fr. tympanum a kettledrum, a panel of a door. See Tympanum, and cf. Tymp.]
A panel; a tympanum.
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.
© Webster 1913.