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Internal-combustion engines

an engine of one or more working cylinders in which the process of combustion takes place within the cylinders.
a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air)
internal-combustion engine

An engine whose fuel is burned inside the engine itself rather than in an outside furnace or burner. Gasoline and diesel engines are internal-combustion engines, as are gas turbine engines such as turbojets. Compare steam engine.

Any engine powered by burning fuel inside it (for example, a standard automobile engine). Internal-combustion engines normally burn fossil fuels and therefore are a major source of air pollution. (See smog.)


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