topsail Meaning, Definition & Usage
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noun a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast
WordNet
Top"sail` noun
Definitions
(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 , andShip .