One of the mysteries of the English language finally explained.
A tricyclic indole alkaloid, C₁₂H₁₀N₂, obtained from the passion flower Passiflora incarnata and various other plants, and from cigarette smoke; 1-methyl-9H-pyrido[3,4-b]indole.
Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From scientific Latin Passiflora, genus name + -ine.
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