graphite
noun
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How to pronounce graphite:

Definition of graphite:

graphite (noun):
used as a lubricant and as a moderator in nuclear reactors.
a soft black lustrous form of carbon that conducts electricity and is used in lead pencils and electrolytic anodes, as a lubricant, and as a moderator in nuclear reactors

Synonyms for graphite:

atomic number 6
black lead
c
carbon
lead
pencil
plumbago