Screw steamer
![The S/S Ukkopekka, a Finnish screw steamer](/Images/godic/202502/09/SS_Ukkopekka_13735.jpg")
A screw steamer or screw steamship is an old style term for a steamship or steamboat, powered by a steam engine, using one or more propellors, also known as screws, to propel it through the water. Such a ship was also known as an 'iron screw steam ship'.