: a chemical compound (such as a drug, pesticide, or carcinogen) that is foreign to a living organism
xenobiotic adjective

Word History

First Known Use

1965, in the meaning defined above

Time Traveler
The first known use of xenobiotic was in 1965

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Cite this Entry

“Xenobiotic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/xenobiotic. Accessed 26 Mar. 2025.

Medical Definition

: a chemical compound (as a drug, pesticide, or carcinogen) that is foreign to a living organism
xenobiotic adjective
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