the outer angle made by the flexure or bend of the arm. That eminence whereon the arm rests, called by us elbow, is by the Latins called cubitus, and the Greeks αγκών, and by others ἀγκώνιον.

ELBOW is also used by architects, masons, &c. for an obtuse angle of a wall, building, or road, which diverts it from its right line.