black lead

Noun
  1. Used as a lubricant and as a moderator in nuclear reactors (synset 114820745)
    is a type of: atomic number 6, c, carbon - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
    subtypes:
    • lead, pencil lead - mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
    • pencil - graphite (or a similar substance) used in such a way as to be a medium of communication
    same as: graphite, plumbago

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