Vanillin n. : A white crystalline aldehyde having a burning taste and characteristic odor of vanilla. It is extracted from vanilla pods, and is also obtained by the decomposition of coniferin, and by the oxidation of eugenol.

Example:
What is the empirical formula of Vanillin?

Taxonomy
synthetic vanillin, lignin, flavor, vanilla, pods, guaiacol, Journal of Agricultural and Food Chemistry, vanilla extract, seed pods, natural vanilla, flavoring, aroma, compounds, vanilla beans, vanilla flavoring, free encyclopedia, Methyl, eugenol.

Defination from the web:
vanillin, instead of natural vanilla extract, is sometimes used as a flavoring agent in foods, beverages, and pharmaceuticals. ... Vanillin was first isolated as a relatively pure substance in 1858 by Nicolas-Theodore Gobley, who obtained it by evaporating a vanilla extract ...