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- pronunciation:
- di
z
 l
en
jihn
| part of speech: |
noun |
| definition: |
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.
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