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
One immediate area of interest is CO₂ conversion, where single-atom catalysts could guide carbon dioxide toward more valuable chemical outputs with higher precision and lower energy demands.
—
Neetika Walter, Interesting Engineering, 3 Dec. 2025
Those data showed a distinctly comet-like object with a bright coma and jets of gas dominated by carbon dioxide and cyanogen — a contrast to the water-rich behavior seen in most solar system comets.
—Kenna Hughes-Castleberry, Space.com, 2 Dec. 2025
Types of underground carbon storage There are several options for storing carbon dioxide underground.
—Ramesh Agarwal, The Conversation, 2 Dec. 2025
Because ethanol burns cleanly, producing only water vapor and a small amount of carbon dioxide, these fireplaces are ventless and require no chimney or flue.
—Angie Hicks, Boston Herald, 30 Nov. 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.
Neetika Walter, Interesting Engineering, 3 Dec. 2025
Those data showed a distinctly comet-like object with a bright coma and jets of gas dominated by carbon dioxide and cyanogen — a contrast to the water-rich behavior seen in most solar system comets.
—Kenna Hughes-Castleberry, Space.com, 2 Dec. 2025
Types of underground carbon storage There are several options for storing carbon dioxide underground.
—Ramesh Agarwal, The Conversation, 2 Dec. 2025
Because ethanol burns cleanly, producing only water vapor and a small amount of carbon dioxide, these fireplaces are ventless and require no chimney or flue.
—Angie Hicks, Boston Herald, 30 Nov. 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 4 Dec. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share