Pyrene definitions

pī'rēn', pī-rēn'
The stone of certain fruits, such as the cherry.
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A carcinogenic, colorless, solid polycyclic aromatic hydrocarbon, C16 H10 , exhibiting blue fluorescence in solution, used in the manufacture of dyes, pesticides, and pharmaceuticals, and as an analytical reagent.
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The stone of an apple, pear, or other drupe that contains several seeds.
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A colorless hydrocarbon, C16H10, obtained from coal tar: its structure consists of the fusion of four benzene rings.
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(chemistry) A polycyclic aromatic hydrocarbon containing four fused benzene rings; first isolated from coal tar.
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(botany) The stone of a drupe.
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Origin of pyrene

From Ancient Greek πυρήν (purÄ“n, “fruit stone").