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Longman Dictionary of Contemporary English
▪ It is a powerful protective antioxidant and lavish amounts of the best quality olive oil can be consumed without risk.
▪ Other plants such as maize may be susceptible to chilling stress because they have an inadequate antioxidant defences.
▪ Researchers there were intrigued by findings that red wine, in test-tube experiments, was found to be an antioxidant.
▪ The 1995 text addresses the science linking antioxidant nutrients found in plant foods with a potentially beneficial role in fighting disease.
▪ Vitamin A and its metabolites appear to have potent antioxidant properties.
Douglas Harper's Etymology Dictionary

1920 (n.); 1932 (adj.), from anti- + oxidant.


a. Acting or having agents that act against oxidation. n. 1 Any substance that acts to slow or prevent the oxidation of another chemical. 2 In nutrition, one of a group of vitamins that act against the effects of free radicals.


n. substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides


An antioxidant is a molecule that inhibits the oxidation of other molecules. Oxidation is a chemical reaction that can produce free radicals, leading to chain reactions that may damage cells. Antioxidants such as thiols or ascorbic acid (vitamin C) terminate these chain reactions. The term "antioxidant" is mainly used for two different groups of substances: industrial chemicals which are added to products to prevent oxidation, and natural chemicals found in foods and body tissue which are said to have beneficial health effects.

To balance the oxidative state, plants and animals maintain complex systems of overlapping antioxidants, such as glutathione and enzymes (e.g., catalase and superoxide dismutase) produced internally or the dietary antioxidants, vitamin A, vitamin C and vitamin E.

Diets containing antioxidant dietary supplements do not improve health nor are they effective in preventing diseases. Randomized clinical trials including supplements of beta-carotene, vitamin A and vitamin E singly or in different combinations found no effect on mortality rate and cancer risk, or may even increase cancer risk. Supplementation with selenium or vitamin E does not reduce the risk of cardiovascular disease. Oxidative stress can be considered as either a cause or consequence of some diseases, an area of research stimulating drug development for antioxidant compounds for use as potential therapies.

Industrial antioxidants have diverse uses, such as food and cosmetics preservatives and inhibitors of rubber or gasoline deterioration.

Usage examples of "antioxidant".

She read an article that curcumin, the yellow pigment in curry, acts as an antioxidant and anti-inflammatory.

Peanuts are high in monounsaturated fats and also contain resveratrol, the same antioxidant found in grapes and wine.

Since you eat more vegetables and fruits on the Soy Zone Diet compared to a traditional grain-based diet, you not only get a greater amount of antioxidants, but also a far greater variety.

As long as the antioxidant binds to the DNA telomere sequence, cell death will not occur.

There were endless listings: research, remedies, anecdotes, case studies, stories, myths, superstitions, male, female, child, genetic antioxidants, caloric restriction, organ replacement, hormone therapy, life expectancy, gerontology.

Useless prior to legal death-massive ly toxic to several organs, on a time scale of hours-the cocktail ofglutamate antagonists, calcium channel blockers, and antioxidants would halt the most damaging biochemical changes in the victim's brain, almost immediately.

Quong held forth about half an hour on the value of proper nutrition, bombarding Harry with a barrage of references to folic acid, antioxidants, glycomates, zinc, and beta-carotene.

Thus at the end of the day he would sit down apprehensively or hopefully, and listen to what the AI had captured during the day: and mostly it was thought that he remembered thinking, but occasionally he would hear himself say, “Synthetic melatonins may be a better antioxidant than natural ones, so that there aren’t enough free radicals,” or “Viriditas is a fundamental mystery, there will never be a grand unified theory,” without having any memory of saying such things, or, often, what they might mean.

He reaches for the bottle beside the bed, dry-swallows two melatonin tablets, a capsule full of antioxidants, and a multivitamin bullet: Then he lies down on the bed, on his back, legs together, arms slightly spread.

He reaches for the bottle beside the bed, dry-swallows two melatonin tablets, a capsule full of antioxidants, and a multivitamin bullet: then he lies down on the bed, on his back, legs together, arms slightly spread.