Definition of Hazardous material:
Any of various substances considered to be especially dangerous to humans, the environment, etc., if not handled, used, or stored in a particular way; especially (in later use) a substance classified as such by a governmental or official body.
Asbestos, chemicals, pesticides, radioactive and other substances that may pose a threat to health, safety, and/or property when stored or transported. Also, any substance that is listed as corrosive, harmful, irritant, reactive, toxic, or highly toxic.
Meaning of Hazardous material & Hazardous material Definition