Dictionary

mortise lock en · NOUN

Meanings

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:

Forms

wikipedia: mortise lock