Webster's English Dictionary

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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