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internal-combustion engine
(-kəm bus′c̸hən)
an engine, as in an airplane, automobile, etc., that obtains its power from heat and pressure produced by the combustion of a fuel-and-air mixture inside a closed chamber or cylinder
See internal-combustion engine in American Heritage Dictionary 4
noun
An engine, such as an automotive gasoline piston engine or a diesel, in which fuel is burned within the engine proper rather than in an external furnace, as in a steam engine.
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