[meyn-seyl; Nautical meyn-suhl]
noun Nautical.
the lowermost sail on a mainmast.

1425–75; late Middle English; see main1, sail Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mainsail (ˈmeɪnˌseɪl, nautical ˈmeɪnsəl)
nautical the largest and lowermost sail on the mainmast

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

MAINSAIL definition

MAchine INdependent SAIL.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Kathryn carries the standard skipjack rig or a jib-headed mainsail and a large jib.
Number of sails, color of mainsail with lettering or design appearing thereon.
It broke off about eight feet from the deck, and with it went the main boom, mainsail and gaff topsail.
Finally, with a storm-reefed mainsail and her trysail set as a jib, she shot away.
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