n. A tricyclic aromatic hydrocarbon obtained from coal tar; used in the manufacture of dyes, pharmaceuticals and explosives; it is isomeric with anthracene.
the GNU version of the Collaborative International Dictionary of English
n. A complex hydrocarbon, C14H10, found in coal tar, and obtained as a white crystalline substance with a bluish fluorescence.
The Century Dictionary and Cyclopedia
n. A crystalline hydrocar- bon, , found in coal-tar, and formed when various hydrocarbons are passed through red-hot tubes. Its solutions have a slight blue fluorescence. It melts at 99° C., but sublimes at a lower temperature.
Word Usage
"To better understand the risks, Hecht's team conducted what they called a "unique" analysis, by labeling and tracking a single PAH — phenanthrene — through the bodies of 12 volunteer smokers."