bio·​haz·​ard | \ˈbī-ō-ˌha-zərd \

Definition of biohazard 

: a biological agent or condition that is a hazard to humans or the environment also : a hazard posed by such an agent or condition

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Other Words from biohazard

biohazardous \ˌbī-​ō-​ˈha-​zər-​dəs \ adjective

Examples of biohazard in a Sentence

The gasoline spill created a serious biohazard.

Recent Examples on the Web

Police then gave him the number of Bio Management Northwest, a biohazard cleaning company, and Gatewood called them. Christine Clarridge, The Seattle Times, "‘So much blood’: Son haunted by questions after Renton police’s ‘shoddy’ investigation of his dad’s death," 4 Dec. 2018 Workers in biohazard suits at the scene where a former Russian spy and his daughter were found sickened by a nerve agent on March 8 in Salisbury, England. Anatoly Kurmanaev, WSJ, "Putin’s Unlikely Ally in His Standoff With the West: His Central Banker," 20 Aug. 2018 The population was small because the monkeys had to be kept in a special biohazard unit to keep the bacteria from infecting other animals or people. Lynne Terry,, "Oregon scientist develops promising vaccine against tuberculosis," 15 Jan. 2018 The first lesson covers how to behave around the chickens and includes basic biohazard training and the need for washing hands. Courant Community, "Community News For The Vernon Edition," 5 June 2018 The workers use trash grabbers to avoid picking up needles or other biohazards directly, Durand said. Devin Kelly, Anchorage Daily News, "In Anchorage spring cleanups, containers for used needles become standard equipment," 13 Apr. 2018 Members of the emergency services in biohazard suits afix a tent over the bench where Sergei Skripal and his daughter were found poisoned in Salisbury, U.K., on March 4. David Brennan, Newsweek, "Nikolai Glushkov: Another Putin Critic Has Just Been Found Dead in London," 13 Mar. 2018 In a paper published in August in Science, scientists addressed this potential biohazard by knocking out the retroviral DNA with the gene editing technology CRISPR-Cas9. Jonathon Keats, Discover Magazine, "Pig Cells That Won’t Go Retro," 24 Jan. 2018 Scientists who worked with the animals undressed, showered and donned a biohazard suit, mask and respirator before going in and then reversed the process on the way out. Lynne Terry,, "Oregon scientist develops promising vaccine against tuberculosis," 15 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'biohazard.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of biohazard

1965, in the meaning defined above

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Statistics for biohazard

Last Updated

9 Dec 2018

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Time Traveler for biohazard

The first known use of biohazard was in 1965

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English Language Learners Definition of biohazard

: a biological or chemical substance or situation that is dangerous to human beings and the environment


bio·​haz·​ard | \ˈbī-ō-ˌhaz-ərd, -ˈhaz- \

Medical Definition of biohazard 

: a biological agent or condition (as an infectious organism or insecure laboratory procedures) that constitutes a hazard to humans or the environment also : a hazard posed by such an agent or condition

Other Words from biohazard

biohazardous \-​ˈhaz-​ərd-​əs \ adjective

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