passepartout
/ˌpaspɑːˈtuː
/ /ˌpɑːspɑːˈtuː/noun
1 (also passepartout frame) A picture or photograph mounted between a piece of glass and a sheet of card (or two pieces of glass) stuck together at the edges with adhesive tape.You find here vendors of Cardboard for passepartouts from Germany and Russia....
- At Halbe you have a choice of five colours and a variety of thicknesses. You can choose between 1.5 and 3 mm thick passepartouts
1.1 [mass noun] Adhesive tape or paper used in making a passepartout frame: a looking glass of passepartout and blackened mercury
2 archaic A master key.
Origin
Late 17th century: from French, literally 'passes everywhere'.