Mainsail definitions

mān'səl, -sāl'
The principal sail of a vessel.
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A quadrilateral or triangular sail set from the after part of the mainmast on a fore-and-aft-rigged vessel.
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A square sail set from the main yard on a square-rigged vessel.
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In a square-rigged vessel, the sail set from the main yard.
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In a fore-and-aft-rigged vessel, the large sail set from the after side of the mainmast.
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(nautical) The largest (only) sail on a sailing vessel.
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