noun, plural plum·ba·gos.
- plumb line,
- plumb rule,
- plumber's helper,
- plumber's snake,
Origin of plumbago
Examples from the Web for plumbago
The adhesion of the plumbago may be often promoted by breathing slightly on the mould.
As the preceding, but employing mixtures of plumbago and crocus in various proportions according to the shade desired.
No spars are found accompanying the ore; iron pyrite is occasionally met with, and plumbago is found in the vicinity.
The rollers are coated with plumbago or other material to prevent adhesion to the molten metal.
Keswick is noted for its manufacture of lead pencils; and the plumbago (locally wad) used to be supplied from mines in Borrowdale.
noun plural -gos
Word Origin for plumbago
"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.