Collins Concise English Dictionary © HarperCollins Publishers::

antioxidant /ˌæntɪˈɒksɪdənt/ n
  1. any substance that retards deterioration by oxidation, esp of fats, oils, foods, petroleum products, or rubber
  2. 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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