American Dictionary of the English Language

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MORTISE, noun mor'tis. A cut or hollow place made in timber by the augur and chisel, to receive the tenon of another piece of timber.

MOR'TISE, verb transitive To cut or make a mortise in.

1. To join timbers by a tenon and mortise; as, to mortise a beam into a post, or a joist into a girder.