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Children's Dictionary
airship an aircraft that is lighter than air and can be steered. An airship has an engine and is filled with gas.
backfire to give off a loud explosive noise that means the engine of a car or other vehicle is not working properly. [2/3 definitions]
bonnet the British word for the metal lid that covers a car's engine. Bonnet has the same meaning as hood. [1/2 definitions]
carburetor the part of an engine that makes a mixture of air and gasoline that is burned by the engine when it runs.
chassis the frame that supports the body and engine in a vehicle.
choke a device that controls the amount of air in an engine carburetor. [1/4 definitions]
clutch1 a device for working the gears of an engine, as in a car. [1/4 definitions]
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.
engineer one who runs an engine or locomotive. [1/2 definitions]
exhaust the smoke or gas given off by an engine. [2/4 definitions]
fire truck a large truck that firefighters ride in to go to a fire and that carries the things firefighters need to put out fires; fire engine.
grease a thick, oily material used on machine parts, such as those in a car engine. Grease lets the parts rub against one another smoothly while the machine is working. [1/4 definitions]
hood the metal lid that covers a car's engine. [1/3 definitions]
idle to run an engine out of gear without causing motion. [1/6 definitions]
ignition a device for getting something to burn by means of a spark or friction. In a car or other vehicle, the ignition is the device or system that ignites the fuel to start the engine. [1/2 definitions]
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.
jet-propelled using the power of a jet engine or engines.
knock a sound made by a bad engine. [1/6 definitions]
locomotive an engine that moves by its own power. It is used to pull or push railroad cars.
motorcycle a vehicle with two wheels, a heavy frame, and an engine.
muffler a device used to make the sound of a car's engine quieter. [1/2 definitions]