Definitions for "Topsail"
Keywords:  gaff, fore, aft, lowermost, sail
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.
A sail or pair of sails set immediately above the lowermost sail of a mast.
A sail set on the topmast.
Keywords:  tops'l, def, see
or Tops'l - See , def. 4.