passe-partout

Noun
  1. is a type of: key - metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
    subtypes: skeleton key - a passkey with much of the bit filed away so that it can open different locks
    same as: master, master key, passkey
  2. is a type of: mounting - framework used for support or display

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