di·​ox·​ide | \ (ˌ)dī-ˈäk-ˌsīd How to pronounce dioxide (audio) \

Definition of dioxide

: an oxide (such as carbon dioxide) containing two atoms of oxygen in the molecule

Examples of dioxide in a Sentence

Recent Examples on the Web Blue Origin has said that its ultimate goal, rather than shuttling wealthy people into space, is to advance technologies to more easily get the carbon-dioxide emissions that fuel climate change into space. Neima Jahromi, The New Yorker, 14 Oct. 2021 His work, which includes methods for attributing the various impacts on climate from both human activity and natural phenomena, has been used to show how human carbon-dioxide emissions can cause increases in temperatures. Benjamin Katz, WSJ, 5 Oct. 2021 Carbon dioxide is missing from slaughterhouses as fertilizer factories across the U.K. and Europe have shut down production in the face of rising gas prices. Sophie Mellor, Fortune, 20 Sep. 2021 However, those temporary reductions have not been enough to make a significant dent in the overall trajectory of carbon-dioxide accumulations in the atmosphere. Joshua Emerson Smith, San Diego Union-Tribune, 7 June 2021 If, however, the sun did not brighten quite so speedily in its youth, then Venus’s carbon-dioxide-belching magma ocean should have frozen over, allowing liquid water to form and pool on the surface. Robin George Andrews, Scientific American, 2 June 2021 Aircraft account for about 2% of global carbon-dioxide emissions. Timothy Puko, WSJ, 9 Sep. 2021 Carbon dioxide concentrations in the atmosphere have reached the highest levels seen in at least 2 million years, according to Monday’s report. Morgan Greene, chicagotribune.com, 9 Aug. 2021 Carbon dioxide concentrations were also three to six times higher than today, so scientists would expect amplified temperatures in the regions. Sora Kim, The Conversation, 12 July 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dioxide.' 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 dioxide

circa 1847, in the meaning defined above

History and Etymology for dioxide

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Time Traveler for dioxide

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The first known use of dioxide was circa 1847

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Last Updated

24 Oct 2021

Cite this Entry

“Dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dioxide. Accessed 24 Oct. 2021.

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English Language Learners Definition of dioxide

: a molecule that has two atoms of oxygen and one atom of another element (such as carbon)


di·​ox·​ide | \ (ˈ)dī-ˈäk-ˌsīd How to pronounce dioxide (audio) \

Medical Definition of dioxide

: an oxide (as carbon dioxide) containing two atoms of oxygen in a molecule

More from Merriam-Webster on dioxide

Nglish: Translation of dioxide for Spanish Speakers

Britannica English: Translation of dioxide for Arabic Speakers


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