Main Entry: poly·chlo·ri·nat·ed biphenyl

Pronunciation: \ˌpäl-i-ˈklōr-ə-ˌnāt-əd-, -ˈklȯr-\

Function: noun

: 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