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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

Derived 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 turkey drives to the capital ended when the steam engine and railways came along in the late 1800s.

From BBC • Dec. 24, 2025

Once they arrived, inventions like the steam engine and indoor plumbing likely helped the insects travel further and get cozy living indoors, where they are most commonly found today.

From Seattle Times • May 20, 2024

The answering growl was like a deep rumble of thunder, or the roar of a steam engine approaching the station, or the sound of a snowy avalanche on some distant alpine peak.

From "The Unseen Guest" by Maryrose Wood