or haz·mat



a material or substance that poses a danger to life, property, or the environment if improperly stored, shipped, or handled: regulations for transporting radioactive materials and other HAZMAT.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for hazmat


noun mainly US and Canadian

  1. substances that pose a danɡer to public health
  2. (as modifier)a hazmat suit

Word Origin for hazmat

C20: haz (ardous) + mat (erials)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for hazmat

also HAZMAT, 1977, condensed from hazardous material(s).

Online Etymology Dictionary, © 2010 Douglas Harper