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ionone

[ahy-uh-nohn] /ˈaɪ əˌnoʊn/
noun, Chemistry
1.
a light-yellow to colorless, slightly water-soluble liquid that is either one or a mixture of two unsaturated ketones having the formula C 13 H 20 O, used chiefly in perfumery.
Origin
1890-1895
1890-95; formerly trademark
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ionone

ionone

/ˈaɪəˌnəʊn/
noun
1.
a yellowish liquid mixture of two isomers with an odour of violets, extracted from certain plants and used in perfumery
2.
either of these two isomers. Formula: C13H20O
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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