Top"sail` (?), n. Naut.
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.
Topsail schooner. Naut. See Schooner, and Illustration in Appendix.
© Webster 1913.