plumbagin
/plʌmˈbeɪdʒɪn/(also plumbagine) Chemistry
noun
A bitter, yellow, crystalline compound, present in the roots of plants of the genus Plumbago; 5-hydroxy-2-methyl-1,4-naphthoquinone, C11H8O3.
Origin
Mid 19th century; earliest use found in American Journal of Science. From French plumbagin from scientific Latin Plumbago, genus name + French -in.