Etymology
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biohazard (n.)

also bio-hazard, "organic material that carries a significant health risk," 1973, from bio- + hazard (n.).

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Definitions of biohazard

biohazard (n.)
hazard to humans or the environment resulting from biological agents or conditions;
biohazard (n.)
any bacterium or virus or toxin that could be used in biological warfare;
Synonyms: biological agent
From wordnet.princeton.edu