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A subdivision of a hospital or a jail. Photo from DeRidder, Louisiana, 2005. 2. A baffle in a lock preventing the full action of the key in the lock operation. 3. An open space within or between the walls of a castle. 4. A projecting ridge of metal in a lock or keyhole that prevents the insertion of any key that does not have a corresponding notch. (Saylor, 1952)