Hypertext Webster Gateway: "mainsail"
From Easton's 1897 Bible Dictionary (easton)
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).
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Mainsail \Main"sail`\, n. (Naut.)
The principal sail in a ship or other vessel.
[They] hoised up the mainsail to the wind. -- Acts
xxvii. 40.
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.
From WordNet (r) 1.7 (wn)
mainsail
n : the lowermost sail on the mainmast
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