monoxide

noun

mon·​ox·​ide mə-ˈnäk-ˌsīd How to pronounce monoxide (audio)
: an oxide containing one atom of oxygen in a molecule

Examples of monoxide in a Sentence

Recent Examples on the Web
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So far, the survey has identified more than 70 types of molecules in the galactic center, including both simple molecules, such as silicon monoxide, and more complex organic ones like ethanol and methanol. Michele Laufik, Martha Stewart, 26 Feb. 2026 Carbon monoxide rebreathing falls into the category known as ‘grey areas’, something the MPCC is increasingly troubled by. Chris Marshall-Bell, New York Times, 26 Feb. 2026 These ranged from complex organic molecules like methanol and ethanol to simple molecules like silicon monoxide. Robert Lea, Space.com, 25 Feb. 2026 Carbon monoxide can also be created when people use portable generators or run cars in their garages to stay warm or charge their phones. Jeremy Tanner, The Hill, 21 Jan. 2026 See All Example Sentences for monoxide

Word History

Etymology

International Scientific Vocabulary

First Known Use

1868, in the meaning defined above

Time Traveler
The first known use of monoxide was in 1868

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Cite this Entry

“Monoxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/monoxide. Accessed 11 Mar. 2026.

Kids Definition

monoxide

noun
mon·​ox·​ide mə-ˈnäk-ˌsīd How to pronounce monoxide (audio)
: an oxide containing only one oxygen atom in the molecule

Medical Definition

monoxide

noun
mon·​ox·​ide mə-ˈnäk-ˌsīd How to pronounce monoxide (audio)
: an oxide containing one atom of oxygen per molecule see carbon monoxide

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