The mainsail or Mains'l will usually be the largest and most powerful sail on a mast. The term "main" is relatively new in nautical terms as the principle sail used to be called the "course" or "courses" and all sails were prefixed with the name of the mast, i.e. main courses'l.
By SailingQuiz November 2019 Category: Sailing Terms
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What does Mainsail mean?
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Definition of the nautical phrase "Mainsail".