Source : Webster's Revised Unabridged Dictionary (1913)

Plumbagin \Plum*ba"gin\, n. [L. plumbago leadwort, fr. plumbum
   lead; cf. F. plombagin.] (Chem.)
   A crystalline substance said to be found in the root of a
   certain plant of the Leadwort ({Plumbago}) family.