• noun
• synonym
• antonym

• barium dioxide (noun)
  1. a white toxic powder obtained by heating barium oxide in air
• carbon dioxide (noun)
  1. the gas produced when animals breathe out, when carbon is burned in air, or when animal or vegetable substances decay
• carbon dioxide acidosis (noun)
  1. as in emphysema or pneumonia acidosis resulting from reduced gas exchange in the lungs ; excess carbon dioxide combines with water to form carbonic acid which increases the acidity of the blood
• chlorine dioxide (noun)
  1. ClO2 an explosive gas used chiefly in bleaching paper, starch, soap or flour and in water purification
• nitrogen dioxide (noun)
  1. NO2 a highly poisonous brown gas
• silicon dioxide (noun)
  1. SiO2 a white or colourless vitreous insoluble solid ; various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
• sulfur dioxide
  1. the American spelling of SULPHUR DIOXIDE
• sulphur dioxide (noun)
  1. a poisonous gas that is a cause of air POLLUTION in industrial areas
• titanium dioxide (noun)
  1. a white powder used as a pigment for its high covering power and durability
• zirconium dioxide (noun)
  1. a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes
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