mortise

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mor·tise

(mōr'tēs),
The seating for the talus formed by the union of the distal fibula and the tibia at the ankle joint.
[M.E., fr. O.Fr., fr. Ar. murtazz, fastened]

mortise

A depression, groove, or hole into which another anatomical structure fits.
References in periodicals archive ?
But even if you're fitting a new door and mortice lock, it's still not too complicated.
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.