commander

An officer in the royal navy, commanding a ship of war of under twenty guns, a sloop of war, armed ship, or bomb-vessel. He was entitled master and commander, and ranked with a major of the army: now simply termed commander, and ranking with lieutenant-colonel, but junior of that rank. The act of the commander is binding upon the interests of all under him, and he is alone responsible for costs and damages: he may act erroneously, and abandon what might have turned out good prize to himself and crew.

♦ Commander is also the name of a large wooden mallet used specially in the sail and rigging lofts, as anything of metal would injure the ropes or canvas.