A xenobiotic (Greek, xenos 'foreign'; bios 'life') is a compound that is foreign to a living organism. Principal xenobiotics include: drugs; carcinogens; and various compounds that have been introduced into the environment by artificial means.
Source:
PAC, 1997, 69, 1251. 'Glossary of terms used in bioinorganic chemistry (IUPAC Recommendations 1997)' on page 1303 (https://doi.org/10.1351/pac199769061251)