Definition of vanillin
: a crystalline phenolic aldehyde C8H8O3 that is extracted from vanilla beans or prepared synthetically and is used especially in flavoring and in perfumery
Learn More about vanillin
Britannica.com: Encyclopedia article about vanillin
Seen and Heard
What made you want to look up vanillin? Please tell us where you read or heard it (including the quote, if possible).