passe-par·​tout | \ˌpas-pər-ˈtü, -ˌpär-\

Definition of passe-partout 

1 : master key opened the door with a passe-partout

2a : mat entry 5

b : a method of framing in which a picture, a mat, a glass, and a back (as of cardboard) are held together by strips of paper or cloth pasted over the edges a picture framed in passe-partout

3 : a strong paper gummed on one side and used especially for mounting pictures

First Known Use of passe-partout

1675, in the meaning defined at sense 1

History and Etymology for passe-partout

French, from passe partout pass everywhere

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Time Traveler for passe-partout

The first known use of passe-partout was in 1675

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the figure or shape of a crescent moon

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