Piperonal, also known as heliotropin, is an organic compound that is commonly found in fragrances and flavors. The molecule is structurally related to benzaldehyde and vanillin. It exists as a white or colorless solid. It has a floral odor commonly described as being similar to that of vanillin and cherry. It is used as flavoring, e.g. in perfumes...
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http://en.wikipedia.org/wiki/Piperonal
• (n.) A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.
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http://thinkexist.com/dictionary/meaning/piperonal/
Pip`er·o'nal noun (Chemistry) A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.
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http://www.encyclo.co.uk/webster/P/93
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