Hypertext Webster Gateway: "topsail"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Topsail \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.
From WordNet (r) 1.7 (wn)
topsail
n : 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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