an area of canvas or other fabric extended to the wind in such a way as to transmit the force of the wind to an assemblage of spars and rigging mounted firmly on a hull, raft, iceboat, etc., so as to drive it along.
some similar piece or apparatus, as the part of an arm that catches the wind on a windmill.
a voyage or excursion, especially in a sailing vessel: They went for a sail around the island.
a sailing vessel or ship.
sailing vessels collectively: The fleet numbered 30 sail.