It is called the lateen sail.
Um.........you just said the answer. its called a sail
Making the sail area smaller is called reefing.
The wind is what causes a sailboat to sail.
Sailboat is to sail as kite is to fly, just as airplane is to wing and oil tanker is to engine.
Yes, sailboat is a compound word. (sail + boat = sailboat)
its sails
sailboat sailcloth sailfish
A sailboat without a sail is but a hull of itself.
Mast
It is a part of the sail.
sail-boat