carbon, n.
freq. cnt. 6
more info an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
<noun.substance>   freq. cnt.: 6 freq. cnt.: 6

C atomic number 6 carbon
more info a copy made with carbon paper

carbon carbon copy
semantic pointers
more info a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper

carbon carbon paper
semantic pointers