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  • diesel
    diesel
    adjective
    noting a machine or vehicle powered by a diesel engine.
  • Diesel
    Diesel
    noun
    Rudolf 1858–1913, German automotive engineer.
Synonyms

diesel

1 American  
[dee-zuhl, -suhl] / ˈdi zəl, -səl /
Or Diesel

adjective

  1. noting a machine or vehicle powered by a diesel engine.

    diesel locomotive.

  2. of or relating to a diesel engine.

    diesel fuel.


noun

  1. diesel engine.

  2. a vehicle powered by a diesel engine.

  3. diesel fuel.

Diesel 2 American  
[dee-zuhl, -suhl] / ˈdi zəl, -səl /

noun

  1. Rudolf 1858–1913, German automotive engineer.


diesel 1 British  
/ ˈdiːzəl /

noun

  1. See diesel engine

  2. a ship, locomotive, lorry, etc, driven by a diesel engine

  3. informal short for diesel oil

  4. slang any cola drink

    spook and diesel

  5. See suck

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Diesel 2 British  
/ ˈdiːzəl /

noun

  1. Rudolf (ˈruːdɔlf). 1858–1913, German engineer, who invented the diesel engine (1892)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of diesel

After R. Diesel, the engine's inventor

Explanation

A diesel is a type of engine that produces enough heat to burn fuel and power a vehicle. Most diesels run on very thick, heavy oil. Large trucks use diesels — also known as diesel engines — and so do some cars, trains, and ships. The earliest diesel was developed in the late 19th century, and its invention is credited to the German engineer Rudolph Diesel, although other inventors laid the groundwork with their development of a very similar type of engine.

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Vocabulary lists containing diesel

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The EU last year scrapped a landmark ban on new petrol and diesel cars set to come into effect in 2035, and India has set a 50-year timeline for transitioning to electric vehicles.

From Barron's • May 19, 2026

The government says it has run out of diesel and fuel oil needed to power the generators that supplement the electricity production of its dilapidated power plants.

From Barron's • May 18, 2026

The swelling shipments have brought stocks of diesel and other fuels on the Gulf Coast down by nearly 19% from prewar levels, according to the EIA.

From The Wall Street Journal • May 18, 2026

It also might emerge in visible diesel shortages or from renewed attacks on Persian Gulf infrastructure.

From MarketWatch • May 18, 2026

I have only the haziest recollection of waving at my mother and sister in a rising cloud of diesel exhaust and mosquitoes as they began their slow, permanent exodus from the Congo.

From "The Poisonwood Bible" by Barbara Kingsolver

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