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Definition of Azulene
1. Noun. (context: organic compound uncountable) A bicyclic aromatic hydrocarbon containing a five- and a seven-membered fused ring; it is a blue, oily liquid first obtained from the essential oil of wormwood. ¹
2. Noun. (context: organic chemistry countable) Any of its derivatives. ¹
¹ Source: wiktionary.com