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Noun: passe-partout  ,pas,paa(r)'too
  1. A key that opens many locks, typically all the locks in a building
    "The superintendent carried a passe-partout for all apartments in the complex";
    - passkey, master key, master
     
  2. A mounting for a picture using gummed tape
    "The artist used a passe-partout to frame her delicate watercolour sketch"

Derived forms: passe-partouts

Type of: key, mounting

Encyclopedia: Passe-partout