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Meaning of forestaysail

fore•stay•sail

Pronunciation: (fôr"stā'sāl", fōr"-Naut.fôr"stā's&schwal, fōr"-), [key]
— n.
  1. a triangular sail set on a forestay; the innermost headsail of a vessel. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.