main·sail /ˈmenˌsel, ˈmen(t)səl/
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.
n : the lowermost sail on the mainmast
(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).