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tympan n. 鼓膜;鼓皮;压格纸 鼓膜;鼓皮;压格纸 tympan n 1: a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end [synonym: {drum}, {membranophone}, {tympan}] Tympan \Tym"pan\, n. [F., fr. L. tympanum a kettledrum, a panel
of a door. See {Tympanum}, and cf. {Tymp}.] 1. A drum. [Obs.] [1913 Webster] 2. (Arch.) A panel; a tympanum. [1913 Webster] 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. [1913 Webster] {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. [1913 Webster]
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