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
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This means dividing the amount of revenues a tourist brings in by the amount of carbon dioxide emissions the tourist triggered traveling there. Lea Lane, Forbes.com, 30 May 2025 Soda makers, on the other hand, can carbonate much more water than a siphon, as the carbon dioxide cartridge is inside the machine to create carbonated water. Bestreviews, Mercury News, 27 May 2025 This releases the carbon dioxide trapped in fresh beans, which would otherwise interfere with extraction when the hot water begins flowing in earnest. Matthew Korfhage, Wired News, 23 May 2025 Good vibes ✈️ Future of fuel: A new class of sustainable aviation fuel pulls carbon dioxide from the air and turns it into jet fuel. Morgan Severson, CNN Money, 21 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

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Cite this Entry

“Carbon dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/carbon%20dioxide. Accessed 8 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

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