pencil lead

Noun
  1. Mixture of graphite with clay in different degrees of hardness;
    The marking substance in a pencil (synset 103656410)
    is a type of: black lead, graphite, plumbago - used as a lubricant and as a moderator in nuclear reactors
    is a part of: lead pencil - pencil that has graphite as the marking substance
    same as: lead

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