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.
Heated engine oil can release carbon monoxide — a gas that can cause dizziness, headaches, even unconsciousness and death. Charlotte Observer, 29 Oct. 2025 Other notable volatile species such as hydrogen sulfide, carbon monoxide or carbon dioxide could be much lower abundance than water ice. Leonard David, Space.com, 29 Oct. 2025 As technology improves and costs drop, Dallas envisions a future where radon detectors are as common as thermostats or carbon monoxide (CO) alarms. Christopher McFadden, Interesting Engineering, 24 Oct. 2025 Install both gas and carbon monoxide detectors to warn you of leaks and emissions from your gas stove. Lauren Bengtson, Better Homes & Gardens, 21 Oct. 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 4 Nov. 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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