Mainsail
Easton’s Bible Dictionary & Webster’s 1828 Dictionary · Matthew George Easton, Noah Webster
Mainsail - (Easton's Bible Dictionary)
(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).
Source of the article
Matthew George Easton, Easton’s Bible Dictionary; Noah Webster, American Dictionary of the English Language (1828)
Bible Strong combined digital edition