TYMPAN

tympan. Tympan, n. a printer's frame, pannel, ornament, area of a pediment, a wheel with pins to turn a windlass

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Tym″pan (?), n. [[F., fr. tympanum a kettledrum, a panel of a door. See Tympanum, and cf. Tymp.]] 1. 1. A drum.
2. 2. (Arch.) A panel; a tympanum.
3. 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. W. Savage.