carbon carbon /ˈkɑːrbən/

noun

1. () An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds  ( atomic number 6 , C , carbon )
   an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
     Carbon is an element found in all living organisms.
   Carbon is an element found in all living organisms.
   
   
2. A copy made with carbon paper  ( carbon , carbon copy )
   a copy made with carbon paper
   
3. 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 )
   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