Noun carbon dioxide has 1 sense
  1. carbon dioxide, CO2, carbonic acid gas - a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
    --1 is a kind of dioxide; greenhouse gas, greenhouse emission
    --1 has particulars: chokedamp, blackdamp
    Derived form: verb carbonate1
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