(physics) The most abundant of the two stable isotopes of carbon, ¹²₆C, having six protons and six neutrons; it is the standard for atomic weight and is used to define the mole.

(chemistry) A very absorbent form of finely powdered carbon; used in purifying gases, and as an antidote for many poisons.

(physics) the less common of the two stable isotopes of carbon, ¹³₆C, having six protons and seven neutrons

Alternative form of carbon disulfide

Attributive form of carbon copy.

The physical cycle of carbon through the Earth’s biosphere, geosphere, hydrosphere and atmosphere that includes such processes as photosynthesis, decomposition, respiration and carbonification.

radiocarbon dating.

(chemistry) the vertical group of the periodic table containing carbon, silicon, germanium, tin and lead; the elements have a valence of 4, and show the typical gradation from nonmetal to metal

any nanostructure of graphene layers arranged as stacked cones, cups or plates

the overuse, by an individual or state, of the carbon dioxide absorption capacity of the world's oceans, vegetation and soil