ˈazhəˌlēn noun
( -s )
Etymology: International Scientific Vocabulary azul- (from Spanish azul blue, from Old Spanish azur, azul ) + -ene — more at azure
1.
a. : a liquid hydrocarbon C 15 H 18 of intense blue color found in some essential oils (as oil of cubebs) and in lignite tar
b. : any of various blue to violet or green hydrocarbons closely related chemically to this hydrocarbon and occurring naturally in essential oils or formed from various colorless naturally occurring sesquiterpenes
2. : a synthetic blue crystalline unsaturated bicyclic hydrocarbon C 10 H 8 that resembles the isometric naphthalene in some properties but is more active chemically and that is the parent compound of the azulenes; cyclo-penta-cyclo-heptene