From The Collaborative International Dictionary of English v.0.44 [gcide]:
Topsail \Top"sail'\, noun (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.
From WordNet (r) 2.0 [wn]:
noun
1: a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast
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