DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   CO2
       n 1: a heavy odorless colorless gas formed during respiration
            and by the decomposition of organic substances; absorbed
            from the air by plants in photosynthesis [syn: carbon
    dioxide, CO2, carbonic acid gas]