nitrogen oxide

noun

: any of several oxides of nitrogen most of which are produced in combustion and are considered to be atmospheric pollutants: such as

Examples of nitrogen oxide in a Sentence

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The sharp deterioration in air quality this week comes following celebrations for Diwali, the Hindu festival of lights, which traditionally involves the widespread use of firecrackers which release sulfur oxides and nitrogen oxides into the air, as well as harmful heavy metals. Rhea Mogul, CNN Money, 22 Oct. 2025 Further modifications typically include the development of fuel nozzles that let the machine run on natural gas rather than aviation fuel, and a combustor that minimizes the emission of nitrogen oxides, a major pollutant. IEEE Spectrum, 20 Oct. 2025 Volkswagen sold nearly 600,000 diesel motor vehicles with devices designed to cheat federal emissions tests for nitrogen oxides or NOx, according to the settlement. Molly Duerig, Miami Herald, 22 Sep. 2025 For example, Erin Brockovich-style reporting is finding that in Memphis, Tennessee, Elon Musk’s xAI supercomputer, Colossus, is worsening air quality due to its massive use of methane-gas turbines, emitting a smog of nitrogen oxides and toxic formaldehyde. Michaela Rychetska, JSTOR Daily, 18 Sep. 2025 See All Example Sentences for nitrogen oxide

Word History

First Known Use

1868, in the meaning defined above

Time Traveler
The first known use of nitrogen oxide was in 1868

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Cite this Entry

“Nitrogen oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nitrogen%20oxide. Accessed 24 Oct. 2025.

Kids Definition

nitrogen oxide

noun
: any of various oxides of nitrogen: as

More from Merriam-Webster on nitrogen oxide

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