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Definition of Polychlorinated biphenyl
1. Noun. (organic chemistry) Any of a class of aromatic organic compounds formed by the chlorination of the hydrocarbon biphenyl; they have many industrial applications but are damaging to the environment. ¹
¹ Source: wiktionary.com
Medical Definition of Polychlorinated biphenyl
1. Biphenyl in which some or all of the hydrogen atoms attached to ring carbons are replaced by chlorine atoms; a probable human carcingogen and teratogen. (05 Mar 2000)