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limonene

[lim-uh-neen] /ˈlɪm əˌnin/
noun, Chemistry
1.
a liquid terpene, C 40 H 16 , occurring in two optically different forms, the dextrorotatory form being present in the essential oils of lemon, orange, etc., and the levorotatory form in Douglas fir needle oil.
Origin
1835-1845
1835-45; < Neo-Latin Limon(um) lemon + -ene
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for limo nene

limonene

/ˈlɪməˌniːn/
noun
1.
a liquid optically active terpene with a lemon-like odour, found in lemon, orange, peppermint, and other essential oils and used as a wetting agent and in the manufacture of resins. Formula: C10H16
Word Origin
C19: from New Latin limonum lemon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for limo nene

limonene

a colourless liquid abundant in the essential oils of pine and citrus trees and used as a lemonlike odorant in industrial and household products and as a chemical intermediate.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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