The Collaborative International Dictionary
Harmine \Har"mine\ (h[aum]r"m[i^]n or -m[=e]n), n.[See Harmaline.] (Chem.) An alkaloid accompanying harmaline (in the Peganum harmala), and obtained from it by oxidation. It is a white crystalline substance.
Wiktionary
n. (context organic compound English) A fluorescent harmala alkaloid belonging to the carboline family of compounds, found in harmal and certain other plants.
Wikipedia
Harmine, also known as telepathine, is a fluorescent harmala alkaloid belonging to the beta-carboline family of compounds. It occurs in a number of different plants, most notably the Middle Eastern plant harmal or Syrian rue (Peganum harmala) and the South American vine Banisteriopsis caapi (also known as "yage" or "ayahuasca"). Harmine reversibly inhibits monoamine oxidase A (MAO-A), an enzyme which breaks down monoamines, making it a RIMA. Harmine selectively binds to MAO-A but does not inhibit the variant MAO-B.
Usage examples of "harmine".
After the Federation armada had mysteriously shifted its offensive away from Abowaku to the Corregidor shoal zone, several regular transports from the Archduchy had arrived at the fortress, and Claret Harmine had been aboard one.