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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Increasing concentrations of carbon dioxide in the atmosphere from burning coal, oil, and natural gas directly induce many plant species to produce more pollen. Umair Irfan, Wired News, 5 Apr. 2025 Your lungs bring oxygen into your body and remove carbon dioxide as a waste product. Staff Author, Verywell Health, 3 Apr. 2025 Fly like a jet stream Swift became a lightning rod in the debate over carbon dioxide emissions in 2022 after a study published by the Yard, a content and public relations firm, put the Eras Tour singer at the top of a wasteful list. Bryan West, USA Today, 31 Mar. 2025 The researchers mixed ammonia, carbon dioxide, methane and nitrogen in a glass bulb, then sprayed the gases with water mist, using a high-speed camera to capture faint flashes of microlightning in the vapor. Mindy Weisberger, CNN Money, 28 Mar. 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 13 Apr. 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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