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diesel engine a type of engine that burns fuel oil. Diesel engines are different from most car engines, which use an electric spark to ignite the fuel. In a diesel engine, the fuel is sprayed into a chamber and set on fire by the heat of air that has been put under high pressure. Big trucks have diesel engines.
fire engine a large truck that carries firefighters and their tools to a fire. Fire engines usually have a ladder and a pump for spraying water or chemicals used to put out fires.
jet engine an engine that causes forward movement by the power of a stream of gases being forced out under pressure in the opposite direction. Jet engines are often used in aircraft.
steam engine an engine which uses steam to supply energy to its mechanical parts.