PLUMBAGO

plumbago. Plumbago, a. carburet of iron, or iron and carbon, called also black lead

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Plum‐ba″go, n. [[L., from plumbum lead.]] 1. 1. (Min.) Same as Graphite.
2. 2. (Bot.) A genus of herbaceous plants with pretty salver-shaped corollas, usually blue or violet; leadwort.