noun
- A heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis.
- synonyms: carbon dioxide, carbonic acid gas
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| APA | WordNet. (2010). CO2. Retrieved September 21, 2026, from http://smartdefine.org/co2/definitions/1266224 |
| Chicago | WordNet. 2010. "CO2" http://smartdefine.org/co2/definitions/1266224 (accessed September 21, 2026). |
| Harvard | WordNet 2010, CO2, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/co2/definitions/1266224>. |
| MLA | WordNet. "CO2" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/co2/definitions/1266224> |