passe-partout

passe-par·tout  (ps-pär-t)

n.

1. Something, such as a master key, that permits one to pass or go at will.

2.

a. A border, such as a mat, that is used to frame or mount a picture.

b. An adhesive tape or a gummed paper used for a similar purpose.

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[French : passer, to pass + partout, everywhere.]

Thesaurus

Noun	1.	passe-partout - key that secures entrance everywhere master key, passkey, master key - metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated skeleton key - a passkey with much of the bit filed away so that it can open different locks
	2.	passe-partout - a mounting for a picture using gummed tape mounting - framework used for support or display