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Definition of antioxidant


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an·ti·ox·i·dant  audio  (nt-ks-dnt, nt-) KEY  

NOUN:
  1. A chemical compound or substance that inhibits oxidation.
  2. A substance, such as vitamin E, vitamin C, or beta carotene, thought to protect body cells from the damaging effects of oxidation.



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The American Heritage® Dictionary of the English Language, Fourth Edition.
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