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 \-benz-ˈpī(ə)r-ˌēn, -ˌbenz-pī-ˈrēn \

Medical Definition of benzo[a]pyrene 

: 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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