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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.
Biohazard Symbol â history and meaning Biohazard Symbol â also known as biological hazards is a symbol that refers to biological substances that pose a health hazard to humans and animals.The symbol is generally used as a warning, so that those who are exposed to the elements can take precautions.The biohazard symbol was developed in 1966 at the initiative of environmental and health engineer Charles Baldwin at the Dow Chemical Company.He had observed that there were many different types of biohazard-related signs and thought it was dangerous, because few people knew their meaning.he biohazard symbol was developed in 1966 at the initiative of environmental and health engineer Charles Baldwin at the Dow Chemical Company. He had observed that there were many different types of biohazard-related signs and thought it was dangerous, because few people knew their meaning.