Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A yellow, crystalline, aromatic hydrocarbon, C20H12, that is a carcinogen found in coal tar and cigarette smoke.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A polycyclic aromatic hydrocarbon (having five fused benzene rings) that is both mutagenic and carcinogenic

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