antimutagen
noun
any substance that acts against a mutagen
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antimutagen
[ăn′tē-myōō′tə-jən, -jĕn′, ăn′tī-]
n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.