antioxidant

American  

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

noun

antioxidants plural

1. Chemistry. any substance that inhibits oxidation, as a substance that inhibits oxidative deterioration of gasoline, rubbers, plastics, soaps, etc.

2. 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.

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adjective

1. Chemistry. of or relating to an antioxidant.

antioxidant British  

/ ˌæntɪˈɒksɪdənt /

noun

1. any substance that retards deterioration by oxidation, esp of fats, oils, foods, petroleum products, or rubber

2. biology a substance, such as vitamin C, vitamin E, or beta carotene, that counteracts the damaging effects of oxidation in a living organism

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antioxidant Scientific  

/ ăn′tē-ŏk′sĭ-dənt,ăn′tī- /

1. 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.

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Other Word Forms

Noun Inflected Forms

• antioxidants
  plural

Etymology

Origin of antioxidant

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

Explanation

An antioxidant is a substance that helps prevent damage caused by certain chemical reactions in our bodies. Fruits, vegetables, and beans are full of antioxidants. Vitamins C and E are familiar antioxidants found in foods like spinach, strawberries, kiwifruit, and lima beans. These substances work in two main ways. They sometimes prevent chemical oxygen reactions that produce damaging, unstable free radicals. They can also bind with the free radicals to make them stable and keep them from causing damage. Antioxidants don't just protect our bodies; they are also used to keep food fresh — a squeeze of lemon juice (Vitamin C) on a sliced apple helps prevent oxidation that turns the fruit brown.

Example Sentences

See Examples For:

antioxidant antioxidants

The red color of red leaf lettuce comes from anthocyanins, a group of polyphenol pigments that have attracted attention for their antioxidant properties.

From Science Daily ● Jun. 15, 2026

The study also examined antioxidant compounds such as vitamin C, phenolics, and flavonoids.

From Science Daily ● May 23, 2026

In contrast, stronger antioxidant activity was associated with lower oxidative stress and better fruit preservation.

From Science Daily ● May 23, 2026

Protective antioxidant enzymes remained more active for longer periods in mangoes stored at 12°C.

From Science Daily ● May 23, 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

Instead, add a handful of berries, kiwis, or other fruits rich in fiber and antioxidants.

From MarketWatch ● Jun. 21, 2026

These antioxidants, found in certain foods, can support heart health, circulation and blood vessel elasticity by reducing inflammation, it says.

From BBC ● Jun. 8, 2026

Because antioxidants like catalase are already widely used and well understood, the team believes this approach could move from laboratory research to clinical use faster than developing an entirely new drug.

From Science Daily ● Jan. 20, 2026

The menu, which follows a recent surge in demand for protein and other macronutrients, includes options with extra iron, omega-3 fatty acids and antioxidants.

From Los Angeles Times ● Jan. 16, 2026

Everything we sold was enriched with antioxidants or enhanced with natural super-fruit extracts or formulated for health and beauty.

From "Darius the Great Is Not Okay" by Adib Khorram