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topsail n. 上桅帆 上桅帆 topsail n 1: a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast 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}. [1913 Webster] {Topsail schooner}. (Naut.) See {Schooner}, and Illustration in Appendix. [1913 Webster]
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