1) Boat 2) Boat type 3) Cutter kin 4) Item aboard a merchant ship 5) Large-oared craft on a ship 1) Sloop 
In the days of sailing ships, a vessel would carry several ship`s boats for various uses. One would be a longboat, an open boat to be rowed by eight or ten oarsmen, two per thwart. The longboat was double banked; its rowing benches were designed to accommodate two men each pulling an oar on opposite sides. Other boats sometimes embarked on a sail....
• (n.) Formerly, the largest boat carried by a merchant vessel, corresponding to the launch of a naval vessel.
Long'boat` noun (Nautical) Formerly, the largest boat carried by a merchant vessel, corresponding to the launch of a naval vessel. 
[n] - the largest boat carried by a merchant sailing vessel
noun the largest boat carried by a merchant sailing vessel
(formerly) the largest boat carried by a sailing ship.