polychlorinated biphenyl

noun
poly·chlo·ri·nat·ed biphenyl | \ˌpä-lē-ˈklȯr-ə-ˌnā-təd- \

Definition of polychlorinated biphenyl 

: 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

First Known Use of polychlorinated biphenyl

1959, in the meaning defined above

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The first known use of polychlorinated biphenyl was in 1959

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polychlorinated biphenyl

noun
poly·chlo·ri·nat·ed biphenyl | \ˌpäl-i-ˈklōr-ə-ˌnāt-əd-, -ˈklȯr- \

Medical Definition of polychlorinated biphenyl 

: 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

More from Merriam-Webster on polychlorinated biphenyl

Britannica.com: Encyclopedia article about polychlorinated biphenyl

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