noun \ˈbī-ō-ˌhaz-ərd, -ˈhaz-\

Definition of BIOHAZARD

: a biological agent or condition (as an infectious organism or insecure laboratory procedures) that constitutes a hazard to humans or the environment; also : a hazard posed by such an agent or condition
bio·haz·ard·ous \-ˈhaz-ərd-əs\ adjective

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