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
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This will allow vessels to switch off their diesel engines while docked, cutting harmful emissions and paving the way for electric ships. Sujita Sinha, Interesting Engineering, 29 Aug. 2025 It was then converted into a passenger ship, the SS Roma, and fitted with a diesel engine before serving as a cruise liner under the name MS Franca C. Oscar Holland, CNN Money, 21 Aug. 2025 Kaellenius argued that consumers would simply hurry to buy cars with petrol or diesel engines ahead of the ban. Rachel More, USA Today, 12 Aug. 2025 The first hull is powered by twin MTU diesel engines that deliver 1,920 hp each, but the standard engine option is two MTUs with 1,700 hp each. Rachel Cormack, Robb Report, 8 Aug. 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 9 Sep. 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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