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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.
This page is about the meaning, origin and characteristic of the symbol, emblem, seal, sign, logo or flag: Biohazard Sign.Biological hazards, also known as biohazards, refer to biological substances that pose a threat to the health of living organisms, primarily that of humans.he biohazard symbol was developed in 1966 by Charles Baldwin, an environmental-health engineer working for the Dow Chemical Company on the containment products. It is used in the labeling of biological materials that carry a significant health risk, including viral samples and used hypodermic needles.