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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