dioxide Definition

an oxide (such as carbon dioxide) containing two atoms of oxygen in the molecule

a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages

a heavy reddish-yellow gas ClO2 used especially as a bleach and disinfectant

a poisonous compound PbO2 used especially as an oxidizing agent and as an electrode in batteries

a dark insoluble compound MnO2 used especially as an oxidizing agent, as a depolarizer of dry cells, and in making glass and ceramics

a toxic reddish brown gas NO2 that is a strong oxidizing agent, is produced by combustion (as of fossil fuels), and is an atmospheric pollutant (as in smog)

silica

a heavy pungent toxic gas SO2 that is easily condensed to a colorless liquid, is used especially in making sulfuric acid, in bleaching, as a preservative, and as a refrigerant, and is a major air pollutant especially in industrial areas

an oxide TiO2 of titanium that occurs in rutile, anatase, and ilmenite and is used especially as a pigment