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carbon dioxide Syllabification: car·bon di·ox·ide
Pronunciation: /ˈˌkärbən dīˈäksīd/

Definition of carbon dioxide in English:


A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
  • Chemical formula: CO2
Example sentences
  • This fixed air is carbon dioxide, into which carbonates decompose when heated.
  • For example, plants give out oxygen and animals expel carbon dioxide and methane.
  • This difference makes it possible for organisms to build up carbon compounds from carbon dioxide.
Definition of carbon dioxide in:
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