Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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combustion chamber an engine chamber, esp. in a jet or rocket, in which fuel or a propellant is burned.
external-combustion engine an engine in which the combustion of fuel occurs outside the cylinder or turbine, as in a steam engine.
internal-combustion engine an engine, esp. an automobile engine, that is powered by the heat and pressure produced by the burning of a mixture of fuel and air in a cylinder or cylinders.
spontaneous combustion the ignition of a substance or material, such as oily cloths or wet hay, caused by the rapid increase of heat from chemical reactions in the substance.