a pathogen, especially one used in or produced by biological research.
the health risk posed by the possible release of such a pathogen into the environment.

Origin of biohazard

Related formsbi·o·haz·ard·ous, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for biohazard

Contemporary Examples of biohazard

  • “Turns out the prunes aren't the only flavor that result in a biohazard situation,” she wrote in April.

    The Daily Beast logo
    The Crazy Baby Food Diet

    Gina Piccalo

    September 22, 2010

British Dictionary definitions for biohazard



material of biological origin that is hazardous to humans
Derived Formsbiohazardous, adjective
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 biohazard

also bio-hazard, 1973, from bio- + hazard (n.).

Online Etymology Dictionary, © 2010 Douglas Harper

biohazard in Medicine




A biological agent, such as a virus or a condition that constitutes a threat to humans, especially in biological research or experimentation.
The potential danger or harm from exposure to such an agent or condition.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

biohazard in Science



A biological agent, such as an infectious microorganism, that constitutes a threat to humans or to the environment, especially one produced in biological research or experimentation.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.