steam engine

engine using pressurized steam to supply mechanical energy

The term steam engine may also refer to an entire railroad steam locomotive. A steam engine is an external combustion heat engine that makes use of the heat energy that exists in steam, converting it to mechanical work.Steam engines were used as the prime mover in pumping stations, locomotives, steam ships, traction engines, steam lorries and other road vehicles. They were essential to the Industrial Revolution and saw widespread commercial use driving machinery in factories and mills, although most have since been superseded by internal combustion engines and electric motors.
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Noun
1. external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder
(hypernym) external-combustion engine
(part-holonym) steam locomotive
(part-meronym) boiler, steam boiler

An engine moved by steam.
  

steam-engine /'sti:m,endʤin/
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