What are Dioxens?

According to some researchers, dioxins are the most carcinogenic substances in the world. They’re industrial byproducts resulting from many different processes, ironically including the incineration of medical waste.

dioxen = two oxen

Are you asking about dioxins?

In organic chemistry a heterocyclic 6-membered ring where 2 carbon atoms have been substituted by oxygen atoms. It is a structure found in a range of molecules but the headliners are all pretty nasty.