Bible Encyclopedias
Plumbago
1911 Encyclopedia Britannica
(from Lat. plumbum, lead), a name frequently applied to graphite, in allusion to its remote resemblance to lead, whence it is popularly called "black-lead." It was formerly held in repute in medicine, but is now regarded as having no medicinal properties of any value.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Plumbago'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/p/plumbago.html. 1910.