Ballast. Material used to load the ship, for stability or submerging purposes.
Barge. General name for vessels built for towing.
Bark. Three-masted vessel, square-rigged on the fore- and main-masts, and fore-and-aft rigged on the mizzen.
Barkentine. Three-masted vessel, square-rigged on the foremast and fore-and-aft on the main- and mizzen-masts.
Beam. The widest part of a vessel.
Bollards. Posts of timber on sides of docks, quays, etc., over which ropes are thrown for hauling vessels alongside.
Boom. The lower spar for a fore-and-aft sail.
Bow. Sides of fore part of boat: the right hand being the starboard bow, and the left hand the port bow.
Bowsprit. Pole projecting from stem forward, and taking forestays and bobstays.
Bridge-house. House built near bridge.