mainsail

 : 
Noun
 : 
main=sail

WORDNET DICTIONARY

Noun mainsail has 1 sense

CIDE DICTIONARY

mainsailn. 
     The principal sail in a ship or other vessel.  [1913 Webster]
    " The mainsail of a ship is extended upon a yard attached to the mainmast, and that of a sloop or schooner upon the boom."  [1913 Webster]
    "[They] hoised up the mainsail to the wind."  [1913 Webster]

OXFORD DICTIONARY

mainsail, n. Naut.
1 (in a square-rigged vessel) the lowest sail on the mainmast.
2 (in a fore-and-aft rigged vessel) a sail set on the after part of the mainmast.


For further exploring for "mainsail" in Webster Dictionary Online


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