| polychlorinated biphenyls | Biphenyl compounds which are extensively chlorinated. Many of these compounds are toxic environmental pollutants. (12 Dec 1998) |
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| polybrominated biphenyls | Biphenyl compounds which are extensively brominated. Many of these compounds are toxic environmental pollutants. (12 Dec 1998) |
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| polychlorinated biphenyl | 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) |