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n. 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.

n. Any of its derivatives.

n. A vegetable principle which imparts a blue color to many of the volatile oils.

"I did learn that an azulene derivative sodium azulene sulfonate is thought to be effective in topically treating sore-throat from either cause, and that it's extracted from chamomile."

polyazulene   

isobutyl    terpinene    pinene    Seneca    sesquiterpene