The Collaborative International Dictionary
Piperonal
Piperonal \Pip`er*o"nal\, n. (Chem.) A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.
Wiktionary
piperonal
n. 1 A white crystalline powder with a floral odour, used in perfume 2 (context chemistry English) The methylene ether of 3,4 dihydroxy benzaldehyde; having a melting point of 37°C and boiling point of 263°C
Wikipedia
Piperonal
Piperonal, also known as heliotropin, is an organic compound which is commonly found in fragrances and flavors. The molecule is structurally related to other aromatic aldehydes such as benzaldehyde and vanillin.