definiens: means any substance, chemical, solvent, compound, waste, residue, contaminant or other material which is regulated by or forms the basis of liability now or hereafter under anyEnvironmental Law, including, without limitation : ( i ) any or any other similar term or phrase as defined underany Environmental Law ; ( ii ) any petroleum, or petroleum products, byproducts or breakdown products, including crudeoil and any fraction thereof ; ( iii ) natural synthetic gas usable for fuel ; ( iv ) any asbestos, lead - based paint, polychlorinated biphenyl, mold, radon gas, radioactive material or byproduct, isomer of dioxin, or any material or thingcontaining or composed of such substance or substances ; and ( v ) any virus, bacteria, protozoa, parasite, fungi, orother pathogen or any other substance, chemical, solvent, compound, waste, residue, 5 contaminant or other material which is hazardous, toxic, poisonous, reactive, corrosive or otherwise may present athreat to human health, safety, natural resources, wildlife or the environment