the series of chemical changes occurring in a compound, especially a drug, as a result of enzymatic or other activity by a living organism.
Origin of biotransformation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Chemical alteration of a substance, especially of a drug, within the body, as by the action of enzymes.biodegradation
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.