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antioxidant

American

[an-tee-ok-si-duhnt, an-tahy-] / ˌæn tiˈɒk sɪ dənt, ˌæn taɪ- /

noun

Chemistry. any substance that inhibits oxidation, as a substance that inhibits oxidative deterioration of gasoline, rubbers, plastics, soaps, etc.
Biochemistry. an enzyme or other organic substance, as vitamin E or beta carotene, that is capable of counteracting the damaging effects of oxidation in animal tissues.

adjective

Chemistry. of or relating to an antioxidant.

antioxidant British

/ ˌæntɪˈɒksɪdənt /

noun

any substance that retards deterioration by oxidation, esp of fats, oils, foods, petroleum products, or rubber
biology a substance, such as vitamin C, vitamin E, or beta carotene, that counteracts the damaging effects of oxidation in a living organism

"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

antioxidant Scientific

/ ăn′tē-ŏk′sĭ-dənt,ăn′tī- /

A chemical compound or substance that inhibits oxidation. Certain vitamins, such as vitamin E, are antioxidants and may protect body cells from damage caused by the oxidative effects of free radicals.

Etymology

Origin of antioxidant

First recorded in 1925–30; anti- + oxidant ( oxid(ize) + -ant )

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.

That’s on top of the injections Leite gives herself regularly: NAD+, which she says makes her feel energized and alleviates her brain fog, and glutathione, which is marketed for antioxidant and immune support.

From The Wall Street Journal • Mar. 18, 2026

They increase levels of "reactive oxygen species," unstable molecules that can damage cells, while also weakening the body's antioxidant defenses that normally keep these molecules under control.

From Science Daily • Mar. 13, 2026

The ultrasound-assisted process also boosted the honey's levels of phenolic compounds, known for their antioxidant and anti-inflammatory effects.

From Science Daily • Mar. 1, 2026

Laboratory research further supported bamboo's nutritional value and antioxidant strength.

From Science Daily • Jan. 16, 2026

“Just some antioxidant recipes. Ready for BiPAP and America’s Next Top Model?” she asked.

From "The Fault in Our Stars" by John Green

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