pol|y|chlo|rin|at|ed biphenyl

pol|y|chlo|rin|at|ed biphenyl «_POL ee KLR uh _NAY tihd, -KLOHR-»,

any one of a group of poisonous chemicals used in industry as electrical insulators and in plastics manufacture, found in wildlife at levels approaching the concentration of DDT and similar insecticides. Abbr: PCB (no periods).