tympan

noun
  1. 1

    A piece of cloth padding placed under the platen of a letterpress to distribute the pressure on the sheet being printed.

  2. 2

    The stretched membrane of a drum.

  3. 3

    A percussion instrument consisting of a hollow cylinder with such a membrane at each end.

  4. 4

    A tympanum.

Source: https://en.wiktionary.org/wiki/tympan