Dictionary.net

a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretch across each end

a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretch across each end

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.

In a printing press, the parchment frame on which the sheet of paper is laid before being turned over on the form of type to be printed.