- a lock housed within a mortise in a door or the like, so that the lock mechanism is covered on both sides.
Origin of mortise lock
First recorded in 1770–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mortise lock
A mortise-lock is fitted in a similar way, but let into a mortise (see Mortising).Woodworking for Beginners
Charles Gardner Wheeler
- a lock set into a mortise in a door so that the mechanism of the lock is enclosed by the door