A sail set at the bow or front of a ship, positioned forward of the main mast.
From 'head' (the bow or front of a ship) and 'sail' (cloth catching wind, from Old English 'segl'). This nautical term dates to at least the 17th century.
Experienced sailors could trim the headsail slightly different angles depending on wind conditions—it's like the difference between a car's front and rear tires working together, a tiny adjustment that makes huge speed differences.
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