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graphite

noun [U]
 
 
/ˈɡræf.aɪt/

Definition

a soft, dark grey form of carbon, used in the middle of pencils, as a lubricant in machines, and in some nuclear reactorsMineralogy
(Definition of graphite noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of graphite