foresailEtymologyFrom fore- + sail. Compare Dutch voorzeil, German Vorsegel, Danish forsejl, Swedish försegel.foresail means the lowest (and usually the largest) square sail hung on the foremast. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounThe lowest (and usually the largest) square sail hung on the foremastA square fore-and-aft sail set on the foremast, but behind it, on a schooner or other similar vessel.A triangular sail set forward of the foremast: forestaysail.