Hazmat
WordNet
noun
(1) An abbreviation for `hazardous material' used on warning signs
"NO HAZMATS IN TUNNEL"
WiktionaryText
Usage notes
Often used adjectivelly, as in the term hazmat suit, the term hazmat (also capitalized as HAZMAT or hyphenated as Haz-Mat) is chiefly used in the U.S.. Its equivalent term in the rest of the English-speaking world is dangerous goods.