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lug-sail

ˈlug-sail
  [Formation uncertain: perh. f. lug v. or lug n.2]
  A four-cornered sail, bent upon a yard which is slung at about one-third or one-fourth of its length from one end, and so hangs obliquely. Also attrib.

1677 Lond. Gaz. No. 1194/4 She is open in the Midships, and sails with a Lugsail, and one Topsail. 1769 Falconer Dict. Marine (1789), Voile de Fortune, the square or lug sail of a galley or tartane. 1799 Naval Chron. I. 214 A lug-sail boat from Calais. 1892 Stevenson Across the Plains 212 The boats with their reefed lugsails scudding for the harbour mouth.

Oxford English Dictionary

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