Bobstay—A rope generally of wire extending from the end of the bowsprit to the stem to hold the spar down.
Bolt-rope—The rope sewn round the edge of a sail to strengthen it.
Boom—The spar used to extend the foot of the mainsail or foresail.
Bow—The forward end of a boat.
Bowsprit—The spar thrust out from the bow upon which the jib is set.
Burgee—The ensign or house flag of a yacht club.
By the head—A boat is said to be by the head, when she is drawing more water forward than aft, or is out of trim owing to her bows being overloaded and depressed.
By the stern—The opposite to by the head.
By the wind—Same as on the wind, or close-hauled.