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.
Roy’s death initially looked like a tragic teen suicide: The Massachusetts teen died on July 12, 2014, from carbon monoxide poisoning. Lynsey Eidell, People.com, 12 July 2025 On the other hand, the carbon monoxide ice could also point to someplace like the outskirts of a system like ours; at 3.7 billion miles away from the Sun, dwarf planet Pluto’s surface temperature ranges from -375° to -400° Fahrenheit, and there is carbon monoxide ice on its surface. Kiona N. Smith, Forbes.com, 11 July 2025 This Kidde portable carbon monoxide detector uses batteries and is compact enough to slip into your carry-on, giving you peace of mind that your hotel room or Airbnb is free of poisonous levels of carbon monoxide. Amelia McBride, Travel + Leisure, 10 July 2025 Be cautious of carbon monoxide danger: When using alternate heating sources, the risk of carbon monoxide poisoning increases. Bebe Hodges, The Enquirer, 2 July 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 Jul. 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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