We found 16 dictionaries that define the word CO2:

General (8 matching dictionaries)

1. CO2: Vocabulary.com
2. co2: Wordnik
3. CO(NH2)2, CO.(NH.C3H5)2, CO.(NH2)2, CO2, co2: Dictionary.com
4. CO2 (album), CO2 (disambiguation), CO2 (opera), CO2, Co2: Wikipedia, the Free Encyclopedia
5. Co2: Rhymezone
6. co2: FreeDictionary.org
7. co2: Mnemonic Dictionary
8. CO2: TheFreeDictionary.com

Business (1 matching dictionary)

9. Construction Term Glossary (No longer online)

Computing (2 matching dictionaries)

10. CO2: Free On-line Dictionary of Computing
11. CO2: Encyclopedia

Medicine (2 matching dictionaries)

12. online medical dictionary (No longer online)
13. CO2: Medical dictionary

Miscellaneous (2 matching dictionaries)

14. CO2: Acronym Finder
15. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

16. co2: Urban Dictionary

Definitions from WordNet (Co2) ▸ noun:  a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis Opposite: oxygen, plants, trees, photosynthesis, absorption Types: carbonic acid, carbon dioxide, dry ice, more... Phrases: co2 capacity test, co2 combining power test, co2 content, co2 extinguisher, co2 pistol, more... Adjectives: atmospheric, elevated, more, total, tidal, supercritical, free, high, liquid, excess, solid Colors:     gray,     green,     blue,     white,     black, more... ▸ Words similar to CO2 ▸ Usage examples for CO2 ▸ Idioms related to CO2 ▸ Wikipedia articles (New!) ▸ Popular adjectives describing CO2 ▸ Words that often appear near CO2 ▸ Rhymes of CO2 ▸ Invented words related to CO2