Graphite
/ɡrˈæˌfaɪt/
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Definition
(noun) An allotrope of carbon, consisting of planes of carbon atoms arranged in hexagonal arrays with the planes stacked loosely, that is used as a dry lubricant, in "lead" pencils, and as a moderator in some nuclear reactors.
Sentence Examples
Two kinds of lubricant are used on a bicycle--oil and graphite.
Only oil of the best quality and pure graphite should be used.
CEFR Practice Quiz
The lead in a standard pencil is actually a mixture of ____ and clay, not actual metallic lead.