carbon

noun

a nonmetallic chemical element found in many inorganic compounds and all organic compounds: diamond and graphite are pure carbon; carbon is the basic element in coal, coke, charcoal, soot, etc.: symbol, C; at. no., 6: a radioactive isotope () is used as a tracer in chemical and biochemical research, and, because of its half-life of 5,730 years and its presence in all carbon-containing matter, it is a means of dating archaeological specimens, fossils, etc.
a sheet of carbon paper
carbon copy
a stick of carbon used in an arc lamp
a carbon plate or rod used in a battery

adjective

of, like, or treated with carbon

See carbon in American Heritage Dictionary 4