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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

steam engines plural

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

Inflected Forms

Nouns

• steam engines
  plural

Etymology

Origin of steam engine

First recorded in 1745–55

Example Sentences

Some see his concerns coming from a sincere sense of what’s at stake from technology that could rank up there with the development of electricity or the steam engine in terms of social upheaval.

From The Wall Street Journal • Jun. 20, 2026

The steam engine, assembly line and personal computer displaced jobs while giving life to industries no committee could foresee.

From The Wall Street Journal • May 26, 2026

We also approach the 250th anniversary of James Watt’s first commercial steam engine going on-line in March 1776, starting an industrial revolution.

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

The steam engine gave another hiss, and the wheels began to roll.

From "The Detective's Assistant" by Kate Hannigan