Plumbago pencil definition

Graphite

Definition:

• (n.) Native carbon in hexagonal crystals, also foliated or granular massive, of black color and metallic luster, and so soft as to leave a trace on paper.

  It is used for pencils (improperly called lead pencils), for crucibles, and as a lubricator, etc. Often called plumbago or black lead.

Example Sentences:

• (1) Here we present images of polydeoxyadenylate molecules aligned in parallel, with their bases lying flat on a surface of highly oriented pyrolytic graphite and with their charged phosphodiester backbones protruding upwards.
• (2) This is a report on a male patient of 71 years of age who had been a graphite mill worker for about 14 years.
• (3) The concentration of gold in whole blood was determined using graphite furnace atomic absorption spectrophotometry.
• (4) As subcritical crack velocities under cyclic loading were found to be many orders of magnitude faster than those measured und