Wiktionary
n. A substance, natural or man-made, which is intrinsically dangerous or otherwise poses a safety hazard. Examples are materials which are explosive, poisonous, chemically active (including acids and other corrosives), radioactive, or biologically active (including human blood and other medical waste).
Usage examples of "hazardous material".
And, using all appropriate hazardous material handling techniques, he had gotten the two barrels, which had to be mixed in transfer, set up to inject.
The FBI tells me they've been searching all morning for a package of some sort which contains hazardous material that came through Miami while we were there.
This is enough to nail him on theft of hazardous material, anyway.
The ring was thickest at the gateway, of course, the point from which the cloud of hazardous material originated, and it thinned as it arced above the planet surface.
Commander Voorhees was dressed in his hazardous material suit, complete with independent oxygen system.