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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.
â refers to materials that present a risk or potential risk to the health of humans, animals, or the environment. They can be infectious agents or chemicals or other products that can damage the environment. Certain chemotherapy drugs and most laboratory reagents fall into the biohazardous material category.