Any of several compounds that are produced by replacing hydrogen atoms in biphenyl with chlorine, have various industrial applications, and are poisonous environmental pollutants which tend to accumulate in animal tissues; also shortened to PCB.

【化】多氯联苯。一种广泛应用于工业上的化学物质，为有毒之环境污染物，能在动物组织中累积，而造成伤害。缩写为 PCB。