noun
polychlorinated biphenyl; PCB
Technical term for a group of synthetic organic compounds once widely used in electrical equipment and industrial applications; now heavily regulated due to toxicity and environmental persistence.
ポリ塩化ビフェニルは環境中で分解されにくい。
Polychlorinated biphenyls are difficult to break down in the environment.
古い変圧
Polychlorinated biphenyls were detected in an old transformer.