A<unk>  is a chemical substance found within an organism that is not naturally produced or expected to be present within the organism. It can also cover substances that are present in much higher concentrations than are usual. Natural compounds can also become<unk> s if they are taken up by another organism, such as the uptake of natural human hormones by fish found downstream of sewage treatment plant outfalls, or the chemical defenses produced by some organisms as protection against predators. The term<unk> s, however, is very often used in the context of pollutants such as dioxins and polychlorinated biphenyls and their effect on the biota, because<unk> s are understood as substances foreign to an entire biological system, i.e. artificial substances, which did not exist in nature before their synthesis by humans. The term<unk>  is derived from the Greek words ξένος (xenos) = foreigner, stranger and βίος (bios) = life, plus the Greek suffix for adjectives -τικός, -ή, -όν (-tikos, -ē, -on).<unk> s may be grouped as carcinogens, drugs, environmental pollutants, food additives, hydrocarbons, and pesticides.
Xenobiotic
Toxoid
Toxicant
Cathartic
Probiotic
Postbiotic
Prebiotic 
Inhalant