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
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.
Air-quality monitors around the refinery did not record elevated amounts of sulfur dioxide, carbon monoxide or particulate matter, Malloy said. Noelle Phillips, Denver Post, 15 Apr. 2026 The truck actually doesn’t use liquid fuel at all, as the burning wood produces carbon monoxide that mixes with hydrogen to power the old pushrod V8. Caleb Jacobs, The Drive, 15 Apr. 2026 However, carbon monoxide is different. Bestreviews, Mercury News, 15 Apr. 2026 In addition to dry air, office spaces often have poor ventilation, which allows carbon dioxide and carbon monoxide to build up. Stephanie Brown, Verywell Health, 14 Apr. 2026 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 27 Apr. 2026.

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

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