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monoxide

American

[mon-ok-sahyd, muh-nok-] / mɒnˈɒk saɪd, məˈnɒk- /

noun

Chemistry.

an oxide containing one oxygen atom in each molecule.

monoxide British

/ mɒˈnɒksaɪd /

noun

an oxide that contains one oxygen atom per molecule

carbon monoxide, CO

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

monoxide Scientific

/ mə-nŏk′sīd′ /

A compound consisting of two elements, one of which is a single oxygen atom. Carbon monoxide, for example, contains a carbon atom bound to a single oxygen atom.

Etymology

Origin of monoxide

First recorded in 1865–70; mon- + oxide

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A rom-com need not be a sparkling shelf covered with bon-bons, but it shouldn’t be a nauseating cloud of carbon monoxide that makes you want to flee.

From The Wall Street Journal • Apr. 2, 2026

Burning them releases carbon monoxide, nitrogen oxides and fine particles that penetrate the lungs and bloodstream.

From BBC • Mar. 19, 2026

Humberside Police said their deaths were thought to be connected to carbon monoxide poisoning.

From BBC • Feb. 21, 2026

Before JWST, researchers relied on ground-based telescopes to measure molecules such as water and carbon monoxide in exoplanet atmospheres.

From Science Daily • Feb. 11, 2026

“Carbon monoxide plus iron gives the volatile iron carbonyl.”

From "I, Robot" by Isaac Asimov

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023