Mainsail
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The principal sail in a ship or other vessel.[They] hoised up the mainsail to the wind. Acts xxvii. 40.
Mainsail meaning & definition 1 of Mainsail.
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Mainsail in Yachting. The principal sail, joined to the main mast.
Mainsail meaning & definition 2 of Mainsail.
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(on a boat or ship) the most important sail (= a sheet of material attached to a pole, to catch the wind and make the boat or ship move) , which is placed on the mainmast :
Mainsail meaning & definition 3 of Mainsail.