A square sail attached to a ship's brig mast, used to catch wind and help propel the vessel forward.
From 'brig' (a two-masted ship) combined with 'sail' (a piece of fabric catching wind). The term emerged in nautical English during the age of sailing ships to describe specific sails used on brigantine vessels.
Brigsails were crucial for the maneuverability of merchant ships during the 1700s-1800s—their specific design allowed captains to tack quickly against the wind, which was revolutionary for ocean trade routes.
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