the lowermost sail on the mainmast
The largest (or only) sail on a sailing vessel.
the principal sail in a ship or other vessel
A mainsail is a sail located behind the main mast of a sailing vessel. On a square rigged vessel, it is the lowest and largest sail on the main mast. On a fore-and-aft rigged vessel, it is the lowest and largest and often the only sail rigged aft of the main mast, and is controlled along its foot by a spar known as the boom. A sail rigged in this position without a boom is generally called a trysail, and is used in extremely heavy weather. The modern Bermuda rig uses a triangular mainsail as the only sail aft of the mast, closely coordinated with a jib for sailing upwind. A large overlapping jib or genoa is often larger than the mainsail. In downwind conditions a spinnaker replaces the jib. Most modern mainsails are "full-batten" mainsails. Battens enable the mainsail to project farther away from the mast. However, there is some cost associated with the battens themselves, "batten pockets" need to be sewn into the sail, and "batten cars" are needed to allow the sail to be raised and lowered. Traditional fore-and-aft rigs used a four-sided gaff rigged mainsail, sometimes setting a gaff topsail above it. A roll mainsail is furled by being rolled within the mast or boom.
The numerical value of mainsail in Chaldean Numerology is: 1
The numerical value of mainsail in Pythagorean Numerology is: 6
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