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pyrene1

[pahy-reen, pahy-reen] /ˈpaɪ rin, paɪˈrin/
noun, Botany
1.
a putamen or stone, especially when there are several in a single fruit; a nutlet.
Origin
1830-1840
1830-40; < New Latin pȳrēna < Greek pȳrḗn fruit stone

pyrene2

[pahy-reen] /ˈpaɪ rin/
noun, Chemistry
1.
a polycyclic, aromatic crystalline hydrocarbon, C 1 6 H 1 0 , consisting of four fused benzene rings, found in coal tar and believed to be carcinogenic.
Origin
1880-85; pyr- + -ene
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pyrene

pyrene1

/ˈpaɪriːn/
noun
1.
a solid polynuclear aromatic hydrocarbon extracted from coal tar. Formula: C16H10
Word Origin
C19: from pyro- + -ene

pyrene2

/ˈpaɪriːn/
noun
1.
(botany) any of several small hard stones that occur in a single fruit and contain a single seed each
Word Origin
C19: from New Latin pyrena, from Greek purēn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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