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nitrous oxide
noun
: a colorless gas N2O that when inhaled produces loss of sensibility to pain preceded by exhilaration and sometimes laughter, that is used especially as an anesthetic in dentistry and as a fuel, and that is an atmospheric pollutant and greenhouse gas produced by combustion
called also laughing gas
compare nitric oxideExamples of nitrous oxide in a Sentence
Recent Examples on the Web
Sulfur dioxide, nitrogen oxides, methane, and nitrous oxide emissions could also be reduced.
—Addy Bink, The Hill, 6 Jan. 2025
These health benefits are largely due to flavanols — bioactive compounds found in plants that trigger nitrous oxide production, which then dilates blood vessels and thus decreases blood pressure.
—Rachel Raposas, People.com, 5 Dec. 2024
The pellet facility operations would also exacerbate nitrous oxide air pollution — which can cause eye irritation, nausea and respiratory issues — by roughly 18%, in violation of local air standards, according to the report.
—Noah Haggerty, Los Angeles Times, 1 Dec. 2024
Manure management and the subsequent methane and nitrous oxide emissions from waste also pose issues.
—Ken Silverstein, Forbes, 25 Nov. 2024
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Word History
First Known Use
1798, in the meaning defined above
Dictionary Entries Near nitrous oxide
Cite this Entry
“Nitrous oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nitrous%20oxide. Accessed 18 Jan. 2025.
Kids Definition
nitrous oxide
noun
: a colorless gas that when inhaled causes loss of the ability to feel pain and sometimes produces laughter and is used especially in dentistry
called also laughing gas
Medical Definition
nitrous oxide
noun
: a colorless gas N2O that when inhaled produces loss of sensibility to pain preceded by exhilaration and sometimes laughter and is used especially as an anesthetic in dentistry
called also laughing gas
More from Merriam-Webster on nitrous oxide
Britannica.com: Encyclopedia article about nitrous oxide
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