Definition of passepartout in English:

passepartout

noun

  • 1A 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. 1.1[mass noun] Adhesive tape or paper used in making a passepartout frame:
      ‘a looking glass of passepartout and blackened mercury’
  • 2archaic A master key.

Origin

Late 17th century: from French, literally passes everywhere.

Pronunciation:

passepartout

/ˌpaspɑːˈtuː/