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
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.
What's particularly valuable is that modern AI technology can calculate the carbon dioxide parts per million (PPM) count required for an enterprise to manufacture or build a product. David Ly, Forbes.com, 22 May 2025 Sparkling and Infused Water Sparkling water is plain water infused with carbon dioxide gas. Lana Barhum, Verywell Health, 20 May 2025 The researchers estimate that would reduce the carbon dioxide and particulate matter coming out of the kilns by about 20%. Jonathan Lambert, NPR, 18 May 2025 The tech industry has invested billions of dollars to expand renewable energy and is increasingly turning to nuclear power as a way to meet its growing electricity demand while trying to reduce carbon dioxide emissions that fuel climate change. Spencer Kimball, CNBC, 17 May 2025 See All Example Sentences for carbon dioxide

Word History

First Known Use

1867, in the meaning defined above

Time Traveler
The first known use of carbon dioxide was in 1867

Browse Nearby Words

Cite this Entry

“Carbon dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/carbon%20dioxide. Accessed 1 Jun. 2025.

Kids Definition

carbon dioxide

noun
: a heavy colorless gas CO2 that is formed especially by the burning and breaking down of organic substances (as in animal respiration), is absorbed from the air by plants in photosynthesis, and has many industrial uses

Medical Definition

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

More from Merriam-Webster on carbon dioxide

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!