from the GNU version of the Collaborative International Dictionary of English
- n. a door lock inserted in a mortise.
- n. See under Lock.
from The Century Dictionary and Cyclopedia
- n. A lock made to fit into a mortise cut in the stile and rail of a door to receive it.
Sorry, no etymologies found.
The mortise lock took a whole minute, with the ghost of my old master breathing disapprovingly down my neck.