Large: A vessel is said to be going large when she has the wind three or four points free.
Leech: The outer edge of a sail.
Luff: To sail closer to the wind.
Lug-sail: A sail set on a yard, as generally used in small boats.
Main-boom: The spar that extends the foot of the mainsail of a fore-and-aft craft.
Mainsheet: The sheet of a mainsail.
Martingale: A short spar under the bowsprit, used to give more spread to the stays that set the bowsprit or jib-boom down.
Nautical mile: 2025·2 yards: thus 13 knots or nautical miles are nearly equal to 15 statute miles.
Nautical day: From noon till noon, 24 hours.
Nothing off: Said to a helmsman when he has to keep a vessel as close to wind as practicable.