Mortise

(mōr'tis), n. [Fr. mortaise, Sp. mortaja, W. mortais, Armor. mortez, Ir. mortis, moirtis, Gael. moirteis.] A cavity cut into a piece of timber, or other material, to receive the end of another piece, made to fit it, called a tenon.

Mortise-joint, a joint made by a mortise and tenon.—Mortise-lock, a lock made to fit into the stile of a door.—Mortise-wheel, a cast-iron wheel, with wooden cogs inserted in mortises on its circumference.

M, mortise; T, tenon.