plumbago

/ˈplʌmˌbeɪgoʊ/

Definitions of plumbago

1. noun

   used as a lubricant and as a moderator in nuclear reactors
   synonyms: black lead, graphite

   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
   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