/ben'zoh puy"reen, -puy reen"/ , n. Chem.
a yellow, crystalline aromatic carcinogenic hydrocarbon, C 20 H 12 , consisting of five fused benzene rings, produced by incomplete combustion of organic material, as coal, petroleum, or tobacco.
Also, benzpyrene .
[ 1925-30; BENZO- or BENZ- + PYRENE ]