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• steam engine
  steam engine

  noun

  an engine worked by steam, typically one in which a sliding piston in a cylinder is moved by the expansive action of the steam generated in a boiler.
• steam-engine
  steam-engine

  noun

  an engine that uses the thermal energy of steam to produce mechanical work, esp one in which steam from a boiler is expanded in a cylinder to drive a reciprocating piston

steam engine

American  

noun

1. an engine worked by steam, typically one in which a sliding piston in a cylinder is moved by the expansive action of the steam generated in a boiler.

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steam-engine British  

noun

1. an engine that uses the thermal energy of steam to produce mechanical work, esp one in which steam from a boiler is expanded in a cylinder to drive a reciprocating piston

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steam engine Scientific  

1. An engine in which the energy of hot steam is converted into mechanical power, especially an engine in which the force of expanding steam is used to drive one or more pistons. The source of the steam is typically external to the part of the machine that converts the steam energy into mechanical energy.

2. Compare internal-combustion engine

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Other Word Forms

• steam-engine
  adjective

Etymology

Origin of steam engine

First recorded in 1745–55

Example Sentences

We watched him operate a vintage letterpress, the mechanisms whirring and clanking like a steam engine.

From The Wall Street Journal • May 2, 2026

The seemingly limitless power of the steam engine helped change that view, making fortunes in mining, metallurgy, brewing, and, especially, textiles.

From Barron's • Jan. 13, 2026

The whistle of a train interrupts the tourist chatter, and a steam engine pulling a long line of freight carriages slowly chugs across the railway bridge from Russia to North Korea.

From BBC • Nov. 1, 2024

It sat next to a steam engine dubbed “Old Dinah” that eventually replaced the mule teams.

From Los Angeles Times • May 15, 2024

South, and James Watt’s 1769 invention of his steam engine to solve the problem of pumping water out of British coal mines.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond