Mortise

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mortise

[′mȯrd·əs]
(engineering)
A groove or slot in a timber for holding a tenon.

Mortise

A rectangular slot cut into one piece of timber, into which a tenon or tongue from another piece is fitted to form a joint.

mortise

A hole, cavity, notch, slot, or recess cut into a timber or piece of other material; usually receives a tenon, but also has other purposes, as to receive a lock.
References in periodicals archive ?
Use a try square to transfer the height marks to the edge of the door, then mark the centre line of the mortice between the height marks .
Square up the top and bottom of the mortice slot with a narrow chisel, then use a wider chisel to smooth the sides, so that the lock body slides neatly in.
Turn out the bolt of the lock with the key and push it into the mortice slot.