ionone

io·none

noun \ˈī-ə-ˌnōn\

Definition of IONONE

: either of two oily liquid isomeric ketones C₁₃H₂₀O that have a strong odor of violets, are found especially in the essential oil of an Australian shrub (Boronia megastigma) but are usually obtained from citral, and are used especially in perfumes