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(Elements & Compounds) another name for graphite
to colour or rub with black lead
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|Noun||1.||black lead - used as a lubricant and as a moderator in nuclear reactors|
pencil lead, lead - mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
atomic number 6, carbon, C - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
pencil - graphite (or a similar substance) used in such a way as to be a medium of communication; "the words were scribbled in pencil"; "this artist's favorite medium is pencil"