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antivitamin

[an-tee-vahy-tuh-min, an-tahy- or, British, -vit-uh-min] /ˌæn tiˈvaɪ tə mɪn, ˌæn taɪ- or, British, -ˈvɪt ə mɪn/
noun, Biochemistry
1.
any substance that interferes with the action of a vitamin.
Origin
1925-1930
1925-30; anti- + vitamin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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antivitamin in Medicine

antivitamin an·ti·vi·ta·min (ān'tē-vī'tə-mĭn, ān'tī-)
n.
A substance that prevents a vitamin from exerting its typical metabolic effects.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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