Steam engine
WordNet
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
WiktionaryText
Noun
- A piston engine driven by steam (as contrasted, for example, with a steam turbine).
- Any heat engine that uses steam as its primary working fluid to do mechanical work.
- A steam locomotive.