definiens: means ( a ) any or as designated, listed or defined ( whether expressly orby reference ) in any Environmental Law, ( b ) any other pollutant, chemical, substance, toxic, infectious, carcinogenic, reactive, corrosive, ignitable or flammable chemical, or chemical compound, or hazardous substance, material orwaste, whether solid, liquid or gas, that is subject to regulation, control or remediation under any Environmental Laws, including any quantity of asbestos in any form, urea, formaldehyde, polychlorinated biphenyls ( PCBs ), radon gas, petroleum, waste oil, crude oil, or any fraction thereof, all forms of natural gas, petroleum products or by - products orderivatives and ( c ) any compound, mixture, solution, product or other substance or material that contains anyhazardous substance or material referred to in clauses ( a ) and ( b ) above