Definition

Noun: 1. A type of engine: An external-combustion engine in which the fuel is burned outside the engine to heat water, creating steam. This steam, under pressure, is then used to produce mechanical motion, typically by forcing a piston to move within a cylinder or by turning a turbine.

Usage

The term "steam engine" refers specifically to the engine unit itself that converts steam pressure into work. It is a countable noun. * The invention of the steam engine was pivotal to the Industrial Revolution. * This museum has a working model of a steam engine. * Early factories were powered by steam engines.

Advanced Usage

• Historical/Technical Context: The term is strongly associated with historical technology, particularly 18th and 19th-century machinery for trains, ships, and factories.
  • James Watt's improvements to the steam engine greatly increased its efficiency and practicality.

Variants and Related Words

• Steam locomotive (n): A railway vehicle powered by a steam engine. (This is a compound term where the steam engine is the component that powers the locomotive).
• Steam turbine (n): A device that converts steam energy into rotary motion using a turbine, rather than a piston. (This is a related but distinct technology often used for generating electricity).

Synonyms

• Steam-powered engine: A more descriptive synonym emphasizing the power source.
• There are no perfect single-word synonyms. Related concepts include external-combustion engine (the technical category) or reciprocating engine (describing the piston action of many steam engines).

Related Phrases

• (To) raise steam: The process of heating water to produce steam in a boiler, which is the first step in operating a steam engine.
  • It took over an hour to raise enough steam to get the engine started.

Noun

1. external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder