plumbago

Definitions of plumbago
  1. noun
    used as a lubricant and as a moderator in nuclear reactors
    synonyms: black lead, graphite
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    types:
    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
    type of:
    C, atomic number 6, carbon
    an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
  2. noun
    any plumbaginaceous plant of the genus Plumbago
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    type of:
    herb, herbaceous plant
    a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
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