Tympan
Pronunciation : Tym"pan
Part of Speech : n.
Etymology : [F., fr. tympanum a kettledrum, a panel of a door. See Tympanum, and cf. Tymp.]
Definition : 1. A drum. [Obs.]
2. (Arch.)
Defn: A panel; a tympanum.
3. (Print.)
Defn: 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.
Source : Webster's Unabridged Dictionary, 1913