A lateen sail is a triangular sail, extended by a lateen yard, which is slung about one quarter the distance from the lower end, which is brought down at the tack while the other end is elevated at an angle of about 45 degrees; used in xebecs, polacres and settees, in the Mediterranean.

Of or pertaining to a peculiar rig used in the Mediterranean and adjacent waters, esp. on the northern coast of Africa. See below.