The Collaborative International Dictionary
Melampyrin
Melampyrin \Mel`am*py"rin\, Melampyrite \Mel`am*py"rite\, n. (Chem.) The saccharine substance dulcite; -- so called because found in the leaves of cowwheat ( Melampyrum). See Dulcite.
Wiktionary
melampyrin
n. melampyrite