graphite
graph.ite \'graf-.i-t\ \gra-'fit-ik\ n [G graphit, fr. Gk graphein to write] : a soft black lustrous carbon that conducts electricity and is used in le ad pencils, crucibles, electrolytic anodes, as a lubricant, and as a moderator in atomic-energy plants (hardness 1-2, sp. gr. 2.09-2.23) - gra.phit.ic aj