lateen sail

from the GNU version of the Collaborative International Dictionary of English.

• noun (Naut.) A triangular sail, extended by a long yard, which is slung at about one fourth of its length from the lower end, to a low mast, this end being brought down at the tack, while the other end is elevated at an angle or about forty-five degrees; -- used in small boats, feluccas, xebecs, etc., especially in the Mediterranean and adjacent waters. Some lateen sails have also a boom on the lower side.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a triangular fore-and-aft sail used especially in the Mediterranean