mainsail

from WordNet (r) 3.0 (2006)

mainsail
    n 1: the lowermost sail on the mainmast

from The Collaborative International Dictionary of English v.0.48

Mainsail \Main"sail`\ (m[=a]n"s[=a]l`), n. (Naut.)
   The principal sail in a ship or other vessel.
   [1913 Webster]

         [They] hoised up the mainsail to the wind. -- Acts
                                                  xxvii. 40.
   [1913 Webster]

   Note: 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]

from The Free On-line Dictionary of Computing (8 July 2008)

MAINSAIL

   {MAchine INdependent SAIL}.

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

MAINSAIL
       MAchine INdependent SAIL (SAIL)

from Easton's 1897 Bible Dictionary

Main-sail
(Gr. artemon), answering to the modern "mizzen-sail," as some
suppose. Others understand the "jib," near the prow, or the
"fore-sail," as likely to be most useful in bringing a ship's
head to the wind in the circumstances described (Acts 27:40).

[email protected]