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Definition of monoxide
monoxide
/məˈnɑːksaɪd/
mon · ox · ide
Plural:monoxides
•Adjective:monoxidic
monoxide Lexical Profile
CEFR
B2
Grade
8
Tier
2
Usage
Top 10k
Syllables
3
monoxide Game Scores & Validity
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• noun
1
A chemical compound containing one oxygen atom per molecule in combination with another element or radical.
Example
"The laboratory test measured the concentration of various metallic monoxides produced during the high-temperature reaction."
2
Carbon monoxide, a colorless, odorless, and toxic gas formed by the incomplete combustion of carbon-containing fuels (used as an elliptical shortening).
Example
"Before winter arrives, homeowners should check the batteries in every smoke and monoxide detector."
Synonyms
View all synonyms for monoxide• Rhymes for monoxide
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Word Origin & Etymology
Coined in the mid-19th century in chemical nomenclature from the prefix 'mon-' (from Ancient Greek 'monos', meaning 'single') and 'oxide'.
Cite this Entry
Wordmom. (2026). Definition of Monoxide. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/monoxide