steam engine ( plural steam engines )

1. A piston engine driven by steam (as contrasted, for example, with a steam turbine ).
2. Any heat engine that uses steam as its primary working fluid to do mechanical work .
3. ( especially British ) A steam locomotive .

• boiler ( steam boiler ) ( what supplies steam to the engine or turbine )

• steam power
• steam tractor
• steam locomotive
• steam shovel
• steam roller

• portable engine
• traction engine