Definition of mainsail in English:



  • 1The principal sail of a ship, especially the lowest sail on the mainmast in a square-rigged vessel.

    • ‘While the mainsail provides a large portion of power, it also affects the boat's directional control.’
    • ‘These days, the majority of new mainsails are designed with a loose-footed arrangement.’
    • ‘Hornblower watched as both ships backed the mainsails, turned the helm hard over, and took up the prescribed position.’
    • ‘These mainsails are the more traditional mainsail cut with short length battens and slab reefing.’
    • ‘As the galley righted itself, another wave struck from the other side, and the ship heeled over so far its mainsail almost touched the water.’
    1. 1.1 The sail set on the after part of the mainmast in a fore-and-aft rigged vessel.