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.

bio- + hazard

biohazardous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biohazard (ˌbaɪəʊˈhæzəd)
material of biological origin that is hazardous to humans

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1973, from bio- + hazard.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biohazard bi·o·haz·ard (bī'ō-hāz'ərd)

  1. A biological agent, such as a virus or a condition that constitutes a threat to humans, especially in biological research or experimentation.

  2. 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.
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American Heritage
Science Dictionary
biohazard   (bī'ō-hāz'ərd)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Finally, place the cardboard mailing container into a plastic biohazard bag.
It can be folded and placed in a biohazard bag or other appropriate receptacle
  when work is completed.
Generators are responsible for supplying items such as biohazard bags, labels,
  and containers.
These materials must be sealed, transported and stored in biohazard containers.
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