Wiktionary
fenchone
n. (context organic compound English) A monoterpenoid ketone present in the essential oil of fennel
Wikipedia
Fenchone
Fenchone is a natural organic compound classified as a monoterpene and a ketone. It is a colorless oily liquid. It has a structure and an odor similar to those of camphor.
Fenchone is a constituent of absinthe and the essential oil of fennel.
Fenchone is used as a flavor in foods and in perfumery.