sulfur dioxide

Definitions of sulfur dioxide
  1. noun
    a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain
    synonyms: sulphur dioxide
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    type of:
    dioxide
    an oxide containing two atoms of oxygen in the molecule
    pollutant
    waste matter that contaminates the water or air or soil
    gas
    a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
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