TYMPANS
Noun
tympans
plural of tympan
Source: Wiktionary
TYMPAN
Tym"pan, n. Etym: [F., fr. tympanum a kettledrum, a panel of a door.
See Tympanum, and cf. Tymp.]
1. A drum. [Obs.]
2. (Arch.)
Definition: A panel; a tympanum.
3. (Print.)
Definition: 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 Edition