mortise locks

Noun

mortise lock (plural mortise locks)

1. A lock that requires a mortise (a pocket or inset) to be cut into the edge of the door or piece of furniture into which the lock is to be fitted.
   • No wonder they broke in, sir: Fake alarm system, single mortise lock on the door, windows that don't close properly...2000 February 5, Douglas Watkinson et al., “Beyond the Grave”, in Midsomer Murders