carbon dioxide

[kahr-buhn dahy-ok-sahyd]

noun

1. 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

noun

1. Also called: carbonic-acid gas. 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: CO 2

carbon dioxide

1. 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: CO ₂ .

carbon dioxide

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

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.)

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

Word History and Origins

Origin of carbon dioxide¹

First recorded in 1870–75

Example Sentences

By following how quickly these isotopes left the body through urine, the scientists were able to determine how much carbon dioxide the athletes exhaled and, in turn, estimate total calorie expenditure.

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The world's burning of fossil fuels is set to release more planet-warming carbon dioxide than ever before this year, new figures show.

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Coal plants are also a major producer of carbon dioxide, a greenhouse gas that contributes to global climate change.

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Meanwhile, fertiliser use emits nitrous oxide -- the third-most-potent greenhouse gas after methane and carbon dioxide.

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Slashing methane emissions -- the second-largest contributor to climate change after carbon dioxide -- is considered one of the fastest ways to curb global warming.

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