[zen-uh-bahy-ot-ik, -bee-, zee-nuh-]
a chemical or substance that is foreign to an organism or biological system.

1915–20; xeno- + biotic

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xenobiotic xen·o·bi·ot·ic (zěn'ə-bī-ŏt'ĭk, zē'nə-)
Foreign to the body or to living organisms. Used of chemical compounds. n.
A xenobiotic chemical.

The American Heritage® Stedman's Medical Dictionary
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