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.
Check batteries in smoke alarms and carbon monoxide detectors. Christopher Cann, USA Today, 8 Dec. 2025 Do not use generators or grills inside as carbon monoxide poisoning can result. Ca Weather Bot, Sacbee.com, 5 Dec. 2025 Clear snow from the exhaust pipe before running the engine to prevent carbon monoxide poisoning. Tom Gavin, EverydayHealth.com, 5 Dec. 2025 Do not use generators or grills inside as carbon monoxide poisoning can result. Bay Area Weather Report, Mercury News, 4 Dec. 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 21 Dec. 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

Last Updated: - Updated example sentences
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