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 oxide

Examples of nitrous oxide in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 See all Example Sentences for nitrous oxide 

Word History

First Known Use

1798, in the meaning defined above

Time Traveler
The first known use of nitrous oxide was in 1798

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

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