单词	polybrominated biphenyl
释义	polybrominated biphenyl noun poly·​bro·​mi·​nat·​ed biphenyl ˌpä-lē-ˈbrō-mə-ˌnā-təd-  : any of several compounds that are similar to polychlorinated biphenyls in environmental toxicity and in structure but that have various hydrogen atoms replaced by bromine rather than chlorine called also PBB Example Sentences Recent Examples on the Web Milliken faced a disaster in 1973 when a chemical company accidentally shipped fire retardant containing highly toxic polybrominated biphenyl, or PBB, instead of cattle feed to thousands of farmers. San Diego Union-Tribune, 18 Oct. 2019 Word History Etymology poly- + brominated, from past participle of brominate First Known Use 1975, in the meaning defined above Medical Definition polybrominated biphenyl noun poly·​bro·​mi·​nat·​ed biphenyl ˌpäl-i-ˈbrō-mə-ˌnāt-əd-  : any of several compounds that are similar to polychlorinated biphenyls in environmental toxicity and in structure except that various hydrogen atoms are replaced by bromine rather than chlorine called also PBB
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