Enzymic modification of a substance by oxidation, reduction,
hydrolysis, hydration, dehydrochlorination, or other reactions
catalyzed by enzymes of the cytosol, of the endoplasmic reticulum
(microsomal enzymes) or of other cell organelles.
Source:
PAC, 2004, 76, 1033
(Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003))
on page 1064