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
Recent Examples on the Web
Sooner or later, the upwelling water and escaping gas will produce a limnic eruption, the violent explosion of tons of carbon dioxide and water into the air.
—
Literary Hub, 22 Oct. 2025
Trees and plants absorb and store a massive amount of carbon dioxide from the air, and in return, through photosynthesis, produce oxygen upon which all life on earth depends.
—Lauren Liebhaber, Miami Herald, 20 Oct. 2025
By measuring the amount of carbon dioxide in the breath, the Warsaw researchers determined that metabolic rates decreased by as much as forty per cent; heart rates, blood pressure, and core temperature fell.
—Clayton Dalton, New Yorker, 18 Oct. 2025
By replacing natural gas with the solar and battery system, the oil company avoids 13,000 tons of carbon dioxide emissions annually while also lowering costs, according to the battery startup’s founder and Chief Innovation Officer John O’Donnell.
—Bloomberg, Mercury News, 16 Oct. 2025
See All Example Sentences for carbon dioxide
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Literary Hub, 22 Oct. 2025
Trees and plants absorb and store a massive amount of carbon dioxide from the air, and in return, through photosynthesis, produce oxygen upon which all life on earth depends.
—Lauren Liebhaber, Miami Herald, 20 Oct. 2025
By measuring the amount of carbon dioxide in the breath, the Warsaw researchers determined that metabolic rates decreased by as much as forty per cent; heart rates, blood pressure, and core temperature fell.
—Clayton Dalton, New Yorker, 18 Oct. 2025
By replacing natural gas with the solar and battery system, the oil company avoids 13,000 tons of carbon dioxide emissions annually while also lowering costs, according to the battery startup’s founder and Chief Innovation Officer John O’Donnell.
—Bloomberg, Mercury News, 16 Oct. 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 24 Oct. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share