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plumbago (n.)

"graphite," 1784, from Latin plumbago "a type of lead ore, black lead," from plumbum "lead" (see plumb (n.)); it renders Greek molybdaina, which was used of yellow lead oxide and also of a type of plant (leadwort). Attested in English in the yellow oxide sense from 1610s; as a type of plant from 1747. Related: Plumbaginous.

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Definitions of plumbago from WordNet

plumbago (n.)
used as a lubricant and as a moderator in nuclear reactors;
Synonyms: graphite / black lead
plumbago (n.)
any plumbaginaceous plant of the genus Plumbago;
From wordnet.princeton.edu