1
: either of two isomeric cyclic crystalline compounds C6H4O2 that are derivatives of benzene
2
: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins
Examples of quinone in a Sentence
Recent Examples on the Web
Long Hill Energy Partners and its project team were awarded federal funds to demonstrate the feasibility of a quinone flow battery as a power source at the High Desert Regional Health Center in the Antelope Valley area of northern Los Angeles County.
—
Noël Fletcher, Forbes.com, 27 June 2025
The team used a quinone known as 9,10-anthraquinone-2,7-disulfonic acid, or AQDS.
—IEEE Spectrum, 8 Jan. 2014
These include flavonoids, polyphenols, tannins, quinones, terpenoids, and alkaloids.
—Devineé Lingo, M.s., Health, 21 Dec. 2024
The push stems from an organic compound in tires called quinone that was newly identified by researchers at the University of Washington, said Birgit Hagedorn, a geochemist and longtime board member of the Anchorage Waterways Council.
—Anchorage Daily News, 26 Apr. 2021
The researchers identified a chemical called 6PPD, a common rubber additive aimed at making car tires last longer, that transforms into deadly 6PPD-quinone when unleashed in nature, reports Lynda V. Maps of the Seattle Times.
—Alex Fox, Smithsonian Magazine, 7 Dec. 2020
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Noël Fletcher, Forbes.com, 27 June 2025
The team used a quinone known as 9,10-anthraquinone-2,7-disulfonic acid, or AQDS.
—IEEE Spectrum, 8 Jan. 2014
These include flavonoids, polyphenols, tannins, quinones, terpenoids, and alkaloids.
—Devineé Lingo, M.s., Health, 21 Dec. 2024
The push stems from an organic compound in tires called quinone that was newly identified by researchers at the University of Washington, said Birgit Hagedorn, a geochemist and longtime board member of the Anchorage Waterways Council.
—Anchorage Daily News, 26 Apr. 2021
The researchers identified a chemical called 6PPD, a common rubber additive aimed at making car tires last longer, that transforms into deadly 6PPD-quinone when unleashed in nature, reports Lynda V. Maps of the Seattle Times.
—Alex Fox, Smithsonian Magazine, 7 Dec. 2020
Cite this Entry
“Quinone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quinone. Accessed 26 Jul. 2025.
Copy CitationMedical Definition
quinone
noun
qui·none
kwin-ˈōn, ˈkwin-ˌ 
1
: either of two isomeric cyclic crystalline compounds C6H4O2 that are extremely irritating to the skin and mucous membranes
2
: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins
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