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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.
Contemporary Examples

And if the buses are fueled with biodiesel, carbon-dioxide emissions would be cut by 90 percent.
Volvo Tests Ultra-Efficient Plug-in Hybrid-Electric Diesel Bus Josh Dzieza May 16, 2013

Historical Examples

Now it is quite certain that the proportion of carbon-dioxide was greatly reduced in the Pleistocene.
The Story of Evolution Joseph McCabe

The reduction of the carbon-dioxide would be even more gradual.
The Story of Evolution Joseph McCabe

But the planetesimal hypothesis has no room for this enormous percentage of carbon-dioxide in the primitive atmosphere.
The Story of Evolution Joseph McCabe

Then air-rejuvenator apparatus reseparated it from the carbon-dioxide you exhaled, so that you could use it over and over.
Comet’s Burial Raymond Zinke Gallun

Whatever excess of carbon-dioxide there may have been in the early atmosphere was cleared by the Coal-forests.
The Story of Evolution Joseph McCabe

Every molecule of carbon-dioxide that crystallized out took two atoms of oxygen with it, completely out of circulation.
Let’em Breathe Space Lester del Rey

The ocean, also, as it became colder, would absorb larger and larger quantities of carbon-dioxide.
The Story of Evolution Joseph McCabe

In the form of carbon-dioxide the leaves eat up the carbon and oxygen from the atmosphere.
Beautiful Bulbous Plants John Weathers

A part is expelled by the lungs as carbon-dioxide, or as it is generally though less correctly termed, carbonic acid.
The Chemistry of Food and Nutrition A. W. Duncan

noun
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
n.

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).