har·ma·line | \ ˈhär-mə-ˌlēn 
\
\Medical Definition of harmaline
: a hallucinogenic alkaloid C13H14N2O found in several plants (Peganum harmala of the family Zygophyllaceae and Banisteriopsis spp. of the family Malpighiaceae) and used in medicine as a stimulant of the central nervous system
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