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A steamboat or steamship, sometimes called a steamer, is a ship in which the primary method of propulsion is steam power, typically driving a propeller or paddlewheel. The term steamboat is usually used to refer to smaller steam-powered boats working on lakes and rivers, particularly riverboats; steamship generally refers to steam-powered ships capable of carrying a (ship's) boat. The term steamwheeler is archaic and rarely used. Steam tonnage in the Lloyd's Register exceeded sailing ships by 1865 and in turn were overtaken by diesel-driven ships in the second half of the twentieth century. Most warships used steam propulsion until the advent of the gas turbine. Today, nuclear-powered warships and submarines use steam to drive turbines, but are not referred to as steamships or steamboats. Screw-driven steamships generally carry the ship prefix "SS" before their names, meaning 'Steam Ship' (or 'State Ship'[citation needed] (U.S.)), paddle steamers usually carry the prefix "PS" and steamships powered by steam turbine may be prefixed "TS" (turbine ship). The term steamer is occasionally used, out of nostalgia, for diesel motor-driven vessels, prefixed "MV".
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