|a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air)|
|internal-combustion engine (ĭn-tûr'nəl-kəm-bŭs'chən) Pronunciation Key
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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.