#dioxide  an oxide containing two atoms of oxygen in the molecule
  supertype:  oxide  any compound of oxygen with another element or a radical
  subtype:  nitrogen_dioxide  a highly poisonous brown gas (NO2)
  subtype:  carbon_dioxide__CO__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
     subtype:  chokedamp__blackdamp  the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life
  subtype:  chlorine_dioxide  an explosive gas (ClO2) used chiefly in bleaching paper or starch or soap or flour and in water purification
  subtype:  sulfur_dioxide__sulphur_dioxide__sulphurdioxide  a toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions

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