carbon dioxide

• carbon dioxid, carbondioxid

• enPR: kär′bən dī-ŏk′sīd
• (Received Pronunciation) IPA^(key): /ˌkɑː.bən daɪˈɒk.saɪd/

• Audio (Southern England):

  (file)

• (General American) IPA^(key): /ˌkɑɹ.bən daɪˈɑk.saɪd/
• (Canada) IPA^(key): /ˌkɑɹ.bən daɪˈɒk.saɪd/
• (General Australian) IPA^(key): /ˌkɐː.bən dɑɪˈɒk.sɑɪd/
• (New Zealand) IPA^(key): /ˌkaː.bən daɪˈɒk.saɪd/
• (Scotland) IPA^(key): /ˌkaɹ.bən daɪˈɔk.saɪd/
• (India) IPA^(key): /ˌkaːʳ.bon ɖajˈɒk.sajɖ/

• Audio (US):

  (file)

• Hyphenation: car‧bon di‧ox‧ide

carbon dioxide (uncountable)

2. (inorganic chemistry) The normal oxide of carbon, CO₂; a colorless, odorless gas formed during respiration and combustion and consumed by plants during photosynthesis.

   Synonyms: carbonic acid gas, CO₂, (acidity regulator) E290

   Hypernym: greenhouse gas

   Coordinate term: carbon monoxide

   • 2008 December 9, Jeff Jacoby, “Skepticism on climate change”, in The International Herald Tribune‎^[1], →ISSN, archived from the original on 29 March 2022:

     There were dozens of presentations in 2008, including: […] "The Overstated Role of Carbon Dioxide on Climate Change."

   • 2013 September–October, Katie L. Burke, “In the News”, in American Scientist‎^[2], archived from the original on 3 September 2013:

     Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.

   • 2024 April 9, Rebecca Lindsey, “Climate Change: Atmospheric Carbon Dioxide”, in Dlugokencky, Ed, editor, Climate.gov‎^[3], USA.gov, archived from the original on 7 April 2025:

     Each year, human activities release more carbon dioxide into the atmosphere than natural processes can remove, causing the amount of carbon dioxide in the atmosphere to increase.

• The O in CO₂ must always be capitalized, otherwise the formula will be interpreted as a diatomic molecule of cobalt; translingual: compare CO to Co.

• carbon dioxide-equivalent
• carbon dioxide snow

• carbon offset
• carbonate
• dry ice