antioxidant

[an-tee-ok-si-duhnt, an-tahy-]
noun
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.
adjective
3.
Chemistry. of or pertaining to an antioxidant.

Origin:
1925–30; anti- + oxidant (oxid(ize) + -ant)

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antioxidant (ˌæntɪˈɒksɪdənt)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

antioxidant
1934, from anti- + oxidant.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
antioxidant   (ān'tē-ŏk'sĭ-dənt, ān'tī-)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The study examined the effects of alcohol on the antioxidant properties of some
  fruit.
The team found that the proteins that make the animal glow have no antioxidant
  capacity, while the non-fluorescent proteins do.
Maybe you even take antioxidant vitamins to help get rid of these unwanted
  toxins.
Green tea contains polyphenols, which have antioxidant properties.
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