Strong’s Greek
G736 — artemon
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀρτέμων
artemon — pronounced ar-tem'-ohn
from a derivative of 737; properly, something ready (or else more remotely from 142 (compare 740); something hung up), i.e. (specially) the topsail (rather foresail or jib) of a vessel:--mainsail. see GREEK for 737 see GREEK for 142 see GREEK for 740
1 occurrence in the KJV.
Acts 27:40
And when they had taken up the anchors, they committed themselves unto the sea, and loosed the rudder bands, and hoised up the mainsail to the wind, and made toward shore.