DIOXIN
dioxin
(noun) any of several toxic or carcinogenic hydrocarbons that occur as impurities in herbicides
Source: WordNet® 3.1
Etymology
Noun
dioxin (plural dioxins)
(organic chemistry) Any of a broad range of toxic or carcinogenic halogenated polycyclic compounds that occur as byproducts of herbicides.
(organic compound) The parent compound, dibenzo-p-dioxin, in which two benzene rings are connected vio two oxygen atoms; oxanthrene.
(organic compound) The unsaturated six-membered heterocycle having four carbon atoms, two oxygen atoms and two double bonds.
Source: Wiktionary