from artao, "to fasten to," is rendered "mainsail" in Acts 27:40 , AV; RV, "foresail." As to the particular kind of sail there mentioned, Sir William Ramsay, quoting from Juvenal concerning the entrance of a disabled ship into harbor by means of a prow-sail, indicates that the artemon would be a sail set on the bow.
With over 3,400 entries, this timeless classic is THE reference guide to New Testament Greek words for English readers. It explains the meaning of the original Greek with the added dimension of the context of the Greek word.Wikipedia
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