a drawing made by an instrument with a lead point.
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How to use plumbago in a sentence
We have likewise found a vein of plumbago, which was an object of search, on the supposition that it was coal.Life of Richard Trevithick, Volume II (of 2) | Francis Trevithick
Red hermatite, iron ore, traces of copper, and plumbago are found along the main Bitter Root.
Even fresh, natural fruits that have been evenly coated with plumbago may be covered with a thin shell of metal.Steam Steel and Electricity | James W. Steele
Iron acquires some little weight by being converted into steel; and when dissolved in acid, it yields more plumbago.
The most common solid employed as a lubricant is graphite, sometimes termed “plumbago” or “black lead.”Aviation Engines | Victor Wilfred Pag
British Dictionary definitions for plumbago
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012