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

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diesel engine a type of internal-combustion engine that burns fuel oil which is ignited by being sprayed into a chamber in which highly compressed air, rather than an electric spark, provides the heat.
engine house a building in which large engines, such as fire engines or locomotives, are kept when not in use.
external-combustion engine an engine in which the combustion of fuel occurs outside the cylinder or turbine, as in a steam engine.
fire engine a motor truck that carries firefighting equipment and personnel to the scene of a fire and usu. has a pump for spraying water or chemicals.
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.
jet engine an engine that develops thrust by the backward expulsion of a jet of fluid or gaseous products of combustion, used esp. in aircraft.
pulsejet engine a jet engine in which the pulsating thrust is provided by intermittent combustion produced by rapid opening and closing of the air intake valves.
radial engine an internal combustion engine in which the cylinders are arranged around a central shaft, formerly used to power propeller-driven aircraft.
Rankine-cycle engine a type of steam engine in which the water that is evaporated into steam is condensed and recycled, developed experimentally as a pollution-reducing alternative to the internal combustion engine.
reaction engine an engine, such as a rocket or jet engine, that develops forward thrust by the rearward expulsion of matter, esp. ignited fuel gases.
reciprocating engine an engine in which the back-and-forth motion of the pistons turns the crankshaft.
rotary engine an engine in which rotation is produced by supplying power directly to the rotary parts, such as a turbine. [2 definitions]
search engine a software program that searches a database or network, esp. the Internet, for data, files, or documents containing terms specified by the user.
steam engine an engine in which pressurized steam supplies mechanical energy, usu. by moving a piston in a closed cylinder.
Stirling engine an external-combustion engine in which the fuel ignited outside the cylinder releases heat that is transferred into the cylinder to a pressurized gas, which moves the pistons.
twin-engine powered by two engines, as an airplane.
V-type engine an automobile engine in which the cylinders are lined up in two rows that are set at an angle to each other, forming a V.
Wankel engine an internal combustion engine that features a triangular rotor revolving in a chamber, and that requires fewer moving parts and is lighter and less efficient than a piston-driven engine.