carbon dioxide
noun
: a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages
Examples of carbon dioxide in a Sentence
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Unlike carbon dioxide or methane, hydrogen does not trap heat directly.
—
Neetika Walter, Interesting Engineering, 17 Dec. 2025
In samples of lunar regolith brought back from the moon by Apollo astronauts, scientists have found puzzling amounts of volatiles, which in this case are elements such as water, carbon dioxide, helium, argon and nitrogen that have low boiling or sublimation points.
—Keith Cooper, Space.com, 15 Dec. 2025
Forster used the very strong and simple relationship between the planet’s temperature and how much carbon dioxide is in the atmosphere.
—Chris Mooney, CNN Money, 15 Dec. 2025
Multiple studies have found that AI data centers are relying heavily on fossil fuels and stand to add millions of metric tons of carbon dioxide to the atmosphere.
—Charlie Campbell, Time, 11 Dec. 2025
See All Example Sentences for carbon dioxide
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Neetika Walter, Interesting Engineering, 17 Dec. 2025
In samples of lunar regolith brought back from the moon by Apollo astronauts, scientists have found puzzling amounts of volatiles, which in this case are elements such as water, carbon dioxide, helium, argon and nitrogen that have low boiling or sublimation points.
—Keith Cooper, Space.com, 15 Dec. 2025
Forster used the very strong and simple relationship between the planet’s temperature and how much carbon dioxide is in the atmosphere.
—Chris Mooney, CNN Money, 15 Dec. 2025
Multiple studies have found that AI data centers are relying heavily on fossil fuels and stand to add millions of metric tons of carbon dioxide to the atmosphere.
—Charlie Campbell, Time, 11 Dec. 2025
See All Example Sentences for carbon dioxide
Cite this Entry
“Carbon dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/carbon%20dioxide. Accessed 19 Dec. 2025.
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