bio·haz·ard
 /ˈbajoʊˌhæzɚd/  noun  ,  pl   -ards [  count  ]
  : a biological or chemical substance or situation that is dangerous to human beings and the environment
   The gasoline spill created a serious biohazard.
  bio·haz·ard·ous /ˌbajoʊˈhæzɚdəs/  adj  
   biohazardous materials