Noun
Same as Graphite.
A genus of herbaceous plants with pretty salver-shaped corollas, usually blue or violet; leadwort.
Source: Webster's dictionaryHe attempted to clear up the confusion between molybdena, plumbago and blacklead after Carl Wilhelm Scheele in 1778 proved that there are at least three different minerals. Source: Internet
Because of its military importance, this unique mine and its production were strictly controlled by the Crown. citation Other names main Historically, graphite was called black lead or plumbago. Source: Internet
Later, Thoreau converted the factory to produce plumbago (graphite), which was used in the electrotyping process. Source: Internet
The term plumbago drawing is normally restricted to 17th and 18th century works, mostly portraits. Source: Internet