xenobiotic

noun

xe·​no·​bi·​ot·​ic ˌze-nō-bī-ˈä-tik How to pronounce xenobiotic (audio)
ˌzē-,
-bē- How to pronounce xenobiotic (audio)
: a chemical compound (such as a drug, pesticide, or carcinogen) that is foreign to a living organism
xenobiotic adjective

Word History

Etymology

xeno- + -biotic

First Known Use

1965, in the meaning defined above

Time Traveler
The first known use of xenobiotic was in 1965

Browse Nearby Words

Cite this Entry

“Xenobiotic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/xenobiotic. Accessed 8 Nov. 2025.

Medical Definition

xenobiotic

noun
xe·​no·​bi·​ot·​ic ˌzen-ō-bī-ˈät-ik How to pronounce xenobiotic (audio) ˌzēn- How to pronounce xenobiotic (audio)
-bē-
: a chemical compound (as a drug, pesticide, or carcinogen) that is foreign to a living organism
xenobiotic adjective
Last Updated: - Definition revised
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