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 Louisianans did not imagine surviving Hurricane Laura only to turn on their generators and die of carbon-monoxide poisoning. Paige Williams, The New Yorker, 4 Apr. 2022 Carbon monoxide is a prime indicator that a plume contains more dangerous materials, caused by incomplete combustion. John Fialka, Scientific American, 25 Apr. 2022 Carbon monoxide is a colorless, odorless, tasteless gas that results from the incomplete burning of various fuels and can cause significant health issues including death when inhaled in high concentrations for long periods of time. Devi Shastri, Milwaukee Journal Sentinel, 19 Mar. 2022 Carbon monoxide can be a big concern in the winter months. Madeline Holcombe, CNN, 11 Jan. 2022 Carbon monoxide poisonings often follow storms or other natural disasters in which people lose power and seek alternative sources for electricity, including generators and cars. NBC News, 3 Sep. 2021 Carbon monoxide poisoning caused by portable generators has killed at least 1,300 people in the U.S. over the last two decades. Los Angeles Times, 23 Dec. 2021 Ideally, the system would eventually function like a home carbon-monoxide detector, quietly checking for danger at all times and blasting an alert when smoke arises — but for entire states. Gregory Thomas, San Francisco Chronicle, 2 Dec. 2021 Experts said the victims probably died of carbon-monoxide poisoning after being trapped inside as the fire burned close to the only clear means of exit, an emergency stairwell. Alastair Gale, WSJ, 30 Dec. 2021 See More

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.

First Known Use of monoxide

1868, in the meaning defined above

History and Etymology for monoxide

International Scientific Vocabulary

Learn More About monoxide

Time Traveler for monoxide

Time Traveler

The first known use of monoxide was in 1868

See more words from the same year

Dictionary Entries Near monoxide




See More Nearby Entries 

Statistics for monoxide

Last Updated

11 May 2022

Cite this Entry

“Monoxide.” Dictionary, Merriam-Webster, Accessed 28 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

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


Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!