Definition of azulene
1a : a liquid hydrocarbon C15H18 of intense blue color found in some essential oils (such 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 C10H8 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
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of azulene
International Scientific Vocabulary azul- (from Spanish azul blue, from Old Spanish azur, azul) + -ene — more at azure
Seen and Heard
What made you want to look up azulene? Please tell us where you read or heard it (including the quote, if possible).