What is "valencene"

n. (context organic compound English) The sesquiterpene ''octahydro-1,8a-dimethyl-7-(1-methylethenyl)naphthalene'' that has a citrus aroma

Valencene is a sesquiterpene that is an aroma component of citrus fruit and citrus-derived odorants. It is obtained inexpensively from Valencia oranges. Valencene is biosynthesized from farnesyl pyrophosphate (FPP) by the CVS enzyme.

It is a precursor to nootkatone, the main contributor to the aroma and flavor of grapefruit.