One of the mysteries of the English language finally explained.
A bitter, yellow, crystalline compound, present in the roots of plants of the genus Plumbago; 5-hydroxy-2-methyl-1,4-naphthoquinone, C₁₁H₈O₃.
Mid 19th century; earliest use found in American Journal of Science. From French plumbagin from scientific Latin Plumbago, genus name + French -in.
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