MAINSAIL

mainsail|mainsheet. Mainsail, or Mainsheet, n. the sail of the mainmast

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Main″sail′ (mān″sāl′), n. (Naut.) The principal sail in a ship or other vessel. hoised up the mainsail to the wind. Acts xxvii. 40. ☞ The mainsail of a ship is extended upon a yard attached to the mainmast, and that of a sloop or schooner upon the boom.