English Dictionary

polychlorinated biphenyl

noun

(organic chemistry) Any of a class of aromatic organic compounds formed by the chlorination of the hydrocarbon biphenyl; they have many industrial applications but are now considered persistent organic pollutants.

Polychlorinated biphenyls are persistent organic pollutants.

意味（1）

(organic chemistry) Any of a class of aromatic organic compounds formed by the chlorination of the hydrocarbon biphenyl; they have many industrial applications but are now considered persistent organic pollutants.

The microbes devoured the chlorides in the earth; as metabolic byproducts, they produced toxic polychlorinated biphenyls (PCBs). By the time the infestation was contained an area of nearly 30 square kilometers had been effectively turned into a toxic waste dump.