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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.
Definition - What does Biological Hazard mean? A biological hazard can be described as a threat to human life or health that is posed by a biological substance(s). A biological hazard is caused by biological waste, such as medical waste, micro organisms, viruses, etc. The biological hazards can affect both human and animal life and health in a variety of ways. Some biohazards have the ability to change DNA structures.