mon·​ox·​ide | \ mə-ˈnäk-ˌsīd How to pronounce monoxide (audio) \

Definition of monoxide

: an oxide containing one atom of oxygen in a molecule

Examples of monoxide in a Sentence

Recent Examples on the Web Several others died from carbon-monoxide poisoning after taking unsafe measures to stay warm, according to the county’s top executive. Elizabeth Findell, WSJ, "Full Death Toll From Texas Storm Could Take Months to Determine," 23 Feb. 2021 Carbon monoxide is a poisonous gas that does not have any smell or taste. Dr. Mishal Reja, ABC News, "Carbon monoxide poisoning: Here's what you need to know," 19 Feb. 2021 At least 17 deaths have been linked to this week’s storm, including several people who died of monoxide poisoning while trying to warm up inside their cars and a family that died in a house fire. Lydia Wang,, "Republicans Are Lying About What’s Causing The Texas Blackouts," 17 Feb. 2021 Carbon monoxide, on the other hand, poisons people by hooking onto hemoglobin, the protein in red blood cells that carries oxygen from the lungs to the body. Kristen Rogers, CNN, "Carbon monoxide poisoning or Covid-19? Here's how you can tell," 23 Oct. 2020 Carbon monoxide levels were found to be at 500 ppm, possibly due to a generator that was running for electricity, the department said. Paige Fry,, "2 critically injured by suspected carbon monoxide poising, Fire Department says," 27 Oct. 2020 The clarity of the ALMA images revealed distinct plumes of sulfur dioxide and sulfur monoxide coming from the volcanoes, contributing between 30% to 50% of the moon's atmosphere. Ashley Strickland, CNN, "Images reveal new insights about Jupiter's volcanic moon Io," 23 Oct. 2020 Carbon monoxide is responsible for about 500 non-fire related deaths each year, according to a federal report about carbon monoxide incidents among emergency personnel. Nora Mishanec,, "Glass Fire: Firefighters checked for carbon monoxide poisoning," 6 Oct. 2020 Carbon monoxide poisoning occurs when the body does not have enough oxygen in its cells. Nora Mishanec,, "Glass Fire: Firefighters checked for carbon monoxide poisoning," 6 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'monoxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of monoxide

1868, in the meaning defined above

History and Etymology for monoxide

International Scientific Vocabulary

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Time Traveler for monoxide

Time Traveler

The first known use of monoxide was in 1868

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Statistics for monoxide

Last Updated

28 Feb 2021

Cite this Entry

“Monoxide.” Dictionary, Merriam-Webster, Accessed 28 Feb. 2021.

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More Definitions for monoxide


mon·​ox·​ide | \ mə-ˈnäk-ˌsīd How to pronounce monoxide (audio) \

Medical Definition of monoxide

: an oxide containing one atom of oxygen per molecule — see carbon monoxide

More from Merriam-Webster on monoxide

Nglish: Translation of monoxide for Spanish Speakers

Britannica English: Translation of monoxide for Arabic Speakers

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