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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.
Regulated medical waste, also known as infectious waste and biohazardous waste, is a waste that is known or reasonably expected to contain pathogens. Pathogens are microorganisms (including bacteria, viruses, rickettsiae, parasites, prions, and fungi) and other agents that can cause disease in humans or animals.