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activated carbon	a form of very porous and thus very absorbent carbon, produced by heating charcoal so as to empty out contained gases, and used to absorb other gases, recover solvents, deodorize, and the like; activated charcoal.
activated charcoal	see "activated carbon."
aerate	to fill or charge (a liquid) with a gas, esp. carbon dioxide. [1/3 definitions]
afterburner	a device for burning partially burned carbon compounds in the exhaust fumes of an internal-combustion engine. [1/2 definitions]
aldehyde	in chemistry, any of a group of organic compounds, such as formaldehyde, the molecule of which contains a terminal carbon atom bound separately to a hydrogen and an oxygen atom.
aliphatic	indicating an organic chemical compound in which the carbon atoms make an open chain.
amine	any of a group of ammonia derivatives in which hydrogen atoms have been replaced by organic groups containing hydrogen and carbon.
asphyxia	a lack of oxygen or excess of carbon dioxide in the lungs that results in suffocation.
atomic mass unit	a unit equal to one twelfth of the mass of an atom of the most abundant kind of carbon, equal to 1.6605 times 10²⁴ gram.
baking powder	a powder containing sodium bicarbonate and an acidic substance, that serves as a leavening agent in baking by releasing carbon dioxide when mixed with water, thereby causing the dough to rise.
benzene ring	the graphic representation of the benzene molecule or its derivatives as a hexagon with a carbon atom at each of its six points, and with attached atoms of hydrogen or other elements.
biogas	any gaseous fuel produced by the bacterial decomposition of organic matter, composed primarily of methane and carbon dioxide.
blackdamp	a suffocating gas composed of carbon dioxide and nitrogen, found as a residue of fires and explosions of combustible gases in mines; chokedamp.
butyl	any of four hydrocarbon radicals having three carbon molecules and a valence of one.
butyl alcohol	any of four isomeric alcohols with three carbon molecules, obtained from petroleum products and used in organic synthesis or as solvents.
C²	symbol of the chemical element carbon.
carbide	a binary compound of carbon and another element, such as calcium or various metals.
carbo-	carbon.
carbohydrate	a compound made of carbon, hydrogen, and oxygen. It is formed mainly by plants, and it is used in the body to easily produce and store energy. Sugars and starches are carbohydrates. [2 definitions]
carbon	a chemical element found in all living things. Pure carbon occurs as diamond or graphite. It is also often found in compounds with other elements. (symbol: C)
carbon 14	a radioactive isotope of carbon that has a half-life of about 5,700 years and whose presence in rock, fossils, and other archaeological specimens enables them to be dated.

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