black lead

Other forms: black leads

Definitions of black lead

1. noun

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

   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