dioxin

/daษชหˆษ’ksษชn/
noun
  1. 1

    Any of a broad range of toxic or carcinogenic halogenated polycyclic compounds that occur as byproducts of herbicides.

  2. 2

    The parent compound, dibenzo-p-dioxin, in which two benzene rings are connected vio two oxygen atoms; oxanthrene.

  3. 3

    The unsaturated six-membered heterocycle having four carbon atoms, two oxygen atoms and two double bonds.

Source: https://en.wiktionary.org/wiki/dioxin