benzopyrene

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ben·zo·py·rene

 (bĕn′zō-pī′rēn′, -pī-rēn′)
n.
Either of two polycyclic aromatic hydrocarbons with the formula C20H12, found in coal tar and cigarette smoke and isolatable as a white or yellow crystalline solid. Both are hazardous, and one is known to be a potent carcinogen. Also called benzpyrene.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ben•zo•py•rene

(ˌbɛn zoʊˈpaɪ rin, -paɪˈrin)

n.
a yellow, crystalline, aromatic hydrocarbon, C20H12, produced by incomplete combustion of organic material, as coal, petroleum, or tobacco.
[1925–30]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations
benzopyrène
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* a twofold reduction in dust emissions (by 2,100 tonnes per year), a fourfold reduction in sulphur dioxide emissions (by 3,500 tonnes per year) and a sixteenfold reduction in benzapyrene emissions;