steam engine
US /ˈstiːm ˌen.dʒɪn/
UK /ˈstiːm ˌen.dʒɪn/
1.
a machine that converts the heat energy of steam into mechanical energy, typically used to power trains or other machinery
:
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The old steam engine chugged slowly down the tracks.
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James Watt made significant improvements to the steam engine.