FORESAIL
foresail
(noun) the lowest sail on the foremast of a square-rigged vessel
Source: WordNet® 3.1
Etymology
Noun
foresail (plural foresails)
(nautical, on a square-rigged ship) The lowest (and usually the largest) square sail hung on the foremast
(nautical) A square fore-and-aft sail set on the foremast, but behind it, on a schooner or other similar vessel.
(nautical, on a sloop) A triangular sail set forward of the foremast: forestaysail.
Source: Wiktionary
Fore"sail`, n. (Naut.)
(a) The sail bent to the foreyard of a square-rigged vessel, being
the lowest sail on the foremast.
(b) The gaff sail set on the foremast of a schooner.
(c) The fore staysail of a sloop, being the triangular sail next
forward of the mast.
Source: Webster’s Unabridged Dictionary 1913 Edition