polycyclic aromatic hydrocarbon

Noun

 * 1)  Any of a class of organic compounds composed of multiple aromatic rings, many of which are found in coal and in oil deposits, and are produced by the combustion of organic matter.

Translations

 * Chinese:
 * Mandarin: 多環芳香烴
 * French:
 * Hungarian: policiklusos aromás szénhidrogén