carbon monoxide

noun

: a colorless odorless very toxic gas CO that is formed as a product of the incomplete combustion of carbon or a carbon compound

Examples of carbon monoxide in a Sentence

Recent Examples on the Web
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Know how to avoid injury from debris, contaminated water, carbon monoxide poisoning, electrocution, and damaged buildings and infrastructure. Staff Reports, AZCentral.com, 4 Sep. 2025 How Friend Was Shot Schneider said that fire crews also assured him that there were no lethal doses of carbon monoxide in the buildings. Anna Commander, MSNBC Newsweek, 29 Aug. 2025 The products of pyrolysis are biochar, the carbon skeleton of the organic matter, gases such as carbon monoxide, hydrogen, and methane, and liquids that, if not condensed into a biofuel, form a sticky tar that can foul equipment. Erik Kobayashi-Solomon, Forbes.com, 28 Aug. 2025 In particular, astronomers led by Andrew Winter of Queen Mary University of London measured the Doppler shift of carbon monoxide gas in each of the disks. Keith Cooper, Space.com, 27 Aug. 2025 See All Example Sentences for carbon monoxide

Word History

First Known Use

1868, in the meaning defined above

Time Traveler
The first known use of carbon monoxide was in 1868

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Cite this Entry

“Carbon monoxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/carbon%20monoxide. Accessed 10 Sep. 2025.

Kids Definition

carbon monoxide

noun
: a colorless odorless very poisonous gas formed by the incomplete burning of carbon

Medical Definition

carbon monoxide

noun
: a colorless odorless very toxic gas CO that burns to carbon dioxide with a blue flame and is formed as a product of the incomplete combustion of carbon

More from Merriam-Webster on carbon monoxide

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