topsail
CIDE DICTIONARY
topsail, n.
In a square-rigged vessel, the sail next above the lowermost sail on a mast. This sail is the one most frequently reefed or furled in working the ship. In a fore-and-aft rigged vessel, the sail set upon and above the gaff. See
Cutter,
Schooner,
Sail, and
Ship. [
1913 Webster]
Topsail schooner. (Naut.) See Schooner, and Illustration in Appendix.
OXFORD DICTIONARY
topsail, n. a square sail next above the lowest fore-and-aft sail on a gaff.
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topsail" in Webster Dictionary Online