benzo[a]pyrene
noun
ben·zo·[a]·py·rene
ˌben-zō-ˌā-ˈpī(ə)r-ˌēn, -zō-ˌal-fə-, -pī-ˈrēn
variants
also 3,4-benzpyrene
: the yellow crystalline highly carcinogenic isomer of the benzopyrene mixture that is formed especially in the burning of cigarettes, coal, and gasoline
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Merriam-Webster unabridged
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