Definitions for "Trysail"
Keywords:  mainsail, aft, mast, sail, abaft
A fore-and-aft sail, bent to a gaff, and hoisted on a lower mast or on a small mast, called the trysail mast, close abaft a lower mast; -- used chiefly as a storm sail. Called also spencer.
A triangular loose-footed sail fitted aft of the mast, often used to replace the mainsail in heavy weather.
A very small sail, used in a very heavy weather instead of a mainsail.