WordReference Random House Unabridged Dictionary of American English © 2017
an•ti•ox•i•dant  (an′tē oksi dənt, an′tī-),USA pronunciation n. 
  1. Chemistryany substance that inhibits oxidation, as a substance that inhibits oxidative deterioration of gasoline, rubbers, plastics, soaps, etc.
  2. Biochemistryan enzyme or other organic substance, as vitamin E or beta carotene, that is capable of counteracting the damaging effects of oxidation in animal tissues.

  1. Chemistryof or pertaining to an antioxidant.
  • anti- + oxidant (oxid(ize) + -ant) 1925–30

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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