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a colorless, odorless, incombustible gas, CO 2 , present in the atmosphere and formed during respiration, usually obtained from coal, coke, or natural gas by combustion, from carbohydrates by fermentation, by reaction of acid with limestone or other carbonates, or naturally from springs: used extensively in industry as dry ice, or carbon dioxide snow, in carbonated beverages, fire extinguishers, etc.
carbon dioxide.
a colourless odourless incombustible gas present in the atmosphere and formed during respiration, the decomposition and combustion of organic compounds, and in the reaction of acids with carbonates: used in carbonated drinks, fire extinguishers, and as dry ice for refrigeration. Formula: CO2 Also called carbonic-acid gas
another name for carbon dioxide

1869, so called because it consists of one carbon and two oxygen atoms. The chemical was known since mid-18c. under the name fixed air; later as carbonic acid gas (1791). “The term dioxide for an oxide containing two atoms of oxygen came into use in the middle of the 19th century.” [Flood].

carbon dioxide n.
A colorless, odorless, incombustible gas formed during respiration, combustion, and organic decomposition and used in inert atmospheres, fire extinguishers, and aerosols.
carbon dioxide
A colorless, odorless gas that is present in the atmosphere and is formed when any fuel containing carbon is burned. It is breathed out of an animal’s lungs during respiration, is produced by the decay of organic matter, and is used by plants in photosynthesis. Carbon dioxide is also used in refrigeration, fire extinguishers, and carbonated drinks. Chemical formula: CO2.
carbon dioxide (CO8)

A compound made up of molecules containing one carbon atom and two oxygen atoms.

Note: Carbon dioxide is normally found as a gas that is breathed out by animals and absorbed by green plants. The plants, in turn, return oxygen to the atmosphere. (See carbon cycle and respiration.)

Note: Carbon dioxide is also given off in the burning of fossil fuels (see greenhouse effect).


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    noting or pertaining to a period of the Paleozoic Era, including the Pennsylvanian and Mississippian periods as epochs, occurring from 345 million to 280 million years ago. (lowercase) producing carbon or coal. the Carboniferous Period or System. Historical Examples At the close of Carboniferous times a marked change took place in the nature of the […]

  • Carbonize

    to char (organic matter) until it forms carbon. to coat or enrich with carbon. to become carbonized. Historical Examples The material began to carbonize at a temperature of 140° to 150°. Some Constituents of the Poison Ivy Plant: (Rhus Toxicodendron) William Anderson Syme To carbonize wood under a movable covering, the plan of meiler, or […]

  • Carbonium

    carbonium carbonium car·bo·ni·um (kär-bō’nē-əm) n. An organic cation having one less electron than a corresponding free radical and with positive charge localized on the carbon atom.

  • Carbonium-ion

    an organic ion containing a positively charged carbon atom (opposed to carbanion). noun (chem) a positively charged organic ion in which most of the positive charge is localized on a carbon atom Compare carbanion

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