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| Subject | English | Romanian |
| environ. | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms | hidrocarbură aromatică policiclică |
| chem. | polycyclic aromatic hydrocarbon | hidrocarburi aromatice policiclice |
| environ. | polycyclic hydrocarbon Hydrocarbon molecule with two or more nuclei; examples are naphtalene, with two benzene rings side by side, or diphenyl, with two bond-connected benzene rings. Also known as polynuclear hydrocarbon | hidrocarbură policiclică |