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

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air-fuel pertaining to the air and fuel injected at the same time into a combustion engine.
alternative fuel a fuel other than fossil fuel used to power an internal combustion engine.
flex-fuel of a vehicle, capable of using more than one type of fuel, typically gasoline and ethanol.
fossil fuel any carbon-containing fuel formed from the remains of prehistoric plants and animals, such as coal, petroleum, and natural gas.
fuel cell any of various devices in which continuous electrical energy is produced from the reaction between a fuel, such as liquid hydrogen, and an oxidant.
fuel injection any of several systems by which fuel is sprayed directly into an engine's combustion chamber. [2 definitions]
fuel oil any oil used for fuel, esp. a liquid petroleum product.
fuel rod a rod-shaped unit that contains nuclear fuel such as plutonium or uranium.
solid fuel any of various rocket propellants, combining fuel and oxidizer in a solid storable mass.
synthetic fuel a hydrocarbon fuel produced from fossil fuels such as shale, tar sands, or coal.