mainsail Meaning, Definition & Usage
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noun the lowermost sail on the mainmast
WordNet
Main"sail` noun
Definitions
(Naut.) The principal sail in a ship or other vessel. [They] 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.