hazmat

noun

haz·​mat ˈhaz-ˌmat How to pronounce hazmat (audio)
often attributive
: a material (such as flammable or poisonous material) that would be a danger to life or to the environment if released without precautions

Did you know?

The origin of "hazmat" is clear enough - it was formed by combining the first three letters of each of two words: "hazardous" and "material." The word hazmat is fairly young, first appearing in print in 1980. Although it is a noun, "hazmat" tends to be used attributively, meaning that it often appears in sentences before another noun as if it were performing the duties of an adjective (as in "hazmat team" and "hazmat worker").

Examples of hazmat in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
At the start, my unnamed character is roused from a cot inside a bunker by a scientist in a hazmat suit with a gaping wound to his side. Christopher Rd, New York Times, 27 Mar. 2025 By the time the federal veterinarians showed up in their hazmat suits, less than a week after the first chickens had fallen, nearly 2,500 birds were dead. Suzy Khimm, NBC news, 21 Mar. 2025 Several years ago workers had to wear hazmat suits when the river was redeveloped because of the toxicity in the soil. Courier-News, Chicago Tribune, 20 Mar. 2025 Officials with the Los Angeles Fire Department’s hazmat unit, arson unit, and officials with the Los Angeles Police bomb squad also responded to the home. Salvador Hernandez, Los Angeles Times, 20 Mar. 2025 See All Example Sentences for hazmat

Word History

Etymology

hazardous material

First Known Use

1972, in the meaning defined above

Time Traveler
The first known use of hazmat was in 1972

Browse Nearby Words

Podcast

Cite this Entry

“Hazmat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hazmat. Accessed 3 Apr. 2025.

Medical Definition

hazmat

noun
haz·​mat
ˈhaz-ˌmat
often attributive
: a material (as radioactive, flammable, explosive, or poisonous material) that would be a danger to life or to the environment if released without necessary precautions being taken
toxic waste hauled away by workers in hazmat suitsTom Spousta
hazmat storage
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!