foresail

noun

Etymology: From fore- + sail. Compare Dutch voorzeil, German Vorsegel, Danish forsejl, Swedish försegel.

1. The lowest (and usually the largest) square sail hung on the foremast
2. A square fore-and-aft sail set on the foremast, but behind it, on a schooner or other similar vessel.
3. A triangular sail set forward of the foremast: forestaysail.