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The Collaborative International Dictionary
Melampyrite

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
melampyrite

n. (context chemistry English) dulcite