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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.
The BioHazard Symbol. Every part of the biohazard symbol can be drawing using a straightedge and a compass. This symbol itself is comprised of three overlapping circles with various parts that are erased. There is a tiny circle in the middle that serves as a place holder for all of the larger circles used in the symbol.iohazard Symbol Origin. As a whole, hazard symbols are designed to warn individuals that a certain material or location contains a harmful âthingsâ that could be potentially lethal.