diesel engine

noun

: an internal combustion engine in which air is compressed to a temperature sufficiently high to ignite fuel injected into the cylinder where the combustion and expansion actuate a piston

Examples of diesel engine in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Distinct from biodiesel — but also based on sustainable substances like vegetable oil — renewable diesel should not require any modifications to a diesel engine in order to flow and combust. Evan Simko-Bednarski, New York Daily News, 17 June 2025 Burnt-out carriages and diesel engines lie on their sides, casualties of Syria’s 14-year civil war. Taylor Luck, Christian Science Monitor, 6 June 2025 In ports without shore power infrastructure, ships could also shut down their diesel engines and run on battery power for several hours. Nathan Diller, USA Today, 10 June 2025 For carbon- free operation, Pure Electric runs on battery power alone, while at the other end, Crossover uses a diesel engine to drive the electric pod motors. Nicole Hoey, Robb Report, 10 June 2025 See All Example Sentences for diesel engine

Word History

First Known Use

1894, in the meaning defined above

Time Traveler
The first known use of diesel engine was in 1894

Cite this Entry

“Diesel engine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diesel%20engine. Accessed 4 Aug. 2025.

Kids Definition

diesel engine

noun
: an internal-combustion engine in which air is compressed to make enough heat to ignite the fuel in the cylinder

More from Merriam-Webster on diesel engine

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