skeleton key definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a key having a large part of the bit filed away so that it can be used to open any of various simple locks
skeleton key definition by American Heritage Dictionary
A key with a large portion of the bit filed away so that it can open different locks. Also called passkey.