WordReference Random House Unabridged Dictionary of American English © 2020
gaff topsail, [Naut.]
  1. Nautical, Naval TermsAlso called  fore-and-aft topsail. a jib-headed fore-and-aft sail set above a gaff.
  2. Nautical, Naval Termsa quadrilateral fore-and-aft sail set above the spanker of a bark, between the gaff of the spanker and an upper gaff.
  • 1785–95

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