[ad_1] noun
  1. a mask of thin paper laid over an illustration to shield certain areas when using an airbrush.
  2. Printing. a mask of strong paper set in a rectangular frame attached to the tympan of certain presses and cut up so as to prevent accidental soiling or printing by furniture or the chase.


  1. printing a light rectangular frame, attached to the tympan of a hand printing press, that carries a parchment sheet to protect the nonprinting areas
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