xenobiotic adjective 2noun 1forms 3 adjective2 •Relating to a substance foreign to the body or ecological system. •Of or pertaining to xenobiosis. noun1 •Any foreign compound not produced by an organism's metabolism.This enzyme is characteristic of harmful bacteria species, and it has deconjugative properties that support the transformation of xenobiotics into more toxic substances. — 2016 formsxenobiotics · more xenobiotic · most xenobiotic