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

Recent Examples on the Web
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In order to comply with those rules, auto manufacturers are required to install emissions control systems to reduce the level of pollutants, such as including nitrogen oxides and carbon monoxide. Sarah N. Lynch, CBS News, 21 Jan. 2026 Emissions of nitrogen oxide, also known as NOx, form smog and soot that is harmful to human health and linked to serious heart and lung diseases. Matthew Daly, Los Angeles Times, 14 Jan. 2026 The devices measure pollutants regulated by the EPA, including nitrogen oxides, ozone and particulate matter from sources like gas turbines, factories and heavy traffic. Jack Armstrong, Memphis Commercial Appeal, 6 Jan. 2026 Multiple studies have shown that burning methane gas produces nitrogen oxide, carbon monoxide, formaldehyde and benzene that can worsen respiratory illnesses such as asthma and increase the risk of cancer. Alan K. Chen, The Conversation, 18 Dec. 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 31 Jan. 2026.

Kids Definition

nitrogen oxide

noun
: any of various oxides of nitrogen: as

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