the series of chemical changes occurring in a compound, especially a drug, as a result of enzymatic or other activity by a living organism.

1950–55; bio- + transformation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

biotransformation bi·o·trans·for·ma·tion (bī'ō-trāns'fər-mā'shən)
Chemical alteration of a substance, especially of a drug, within the body, as by the action of enzymes. Also called biodegradation.

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