MEANING: noun: Dangerous material, for / example, something toxic, explosive, or inflammable.
adjective: Relating to hazardous material.

ETYMOLOGY: A shortening of hazardous + material. Earliest documented use: 1972.

HAZMATH - the calculus of danger

HAR ! M.A.T. - my getting a Masters of Arts in Teaching would be laughable

HAZOMAT - where to buy teasing routines