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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While fine particulate matter is made of charred bits flung directly into the atmosphere by wildfires, ozone forms after the fact, when nitrogen oxides and volatile organic compounds interact with light. Joanna Thompson, Space.com, 12 May 2026 Those backup generators, often powered using combustion turbines, are associated with pollution in the form of carbon monoxide, nitrogen oxides, volatile organic compounds, particulate matter and some hazardous air pollutants, according to the EPA. Sofi Zeman may 11, Kansas City Star, 11 May 2026 Under rules adopted in 2023, only zero-nitrogen oxide water heaters would be sold starting in 2027, followed by air heaters in 2029 and larger commercial systems in 2031. Kenny Choi, CBS News, 5 May 2026 Ozone pollution, also called smog, is the presence of ground-level ozone that forms when chemicals like nitrogen oxides and volatile organics from electric utilities, car exhaust, gasoline vapors, industrial facilities and chemical solvents react to sunlight. Jen Christensen, CNN Money, 22 Apr. 2026 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 14 May. 2026.

Kids Definition

nitrogen oxide

noun
: any of various oxides of nitrogen: as

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