polychlorinated biphenyl
noun
poly·chlo·ri·nat·ed biphenyl
ˌpä-lē-ˈklȯr-ə-ˌnā-təd-
: any of several compounds that are produced by replacing hydrogen atoms in biphenyl with chlorine, have various industrial applications, and are toxic environmental pollutants which tend to accumulate in animal tissues
called also PCB
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Merriam-Webster unabridged
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