Definition of sulphur dioxide noun from the Oxford Advanced Learner's Dictionary

 

sulphur dioxide

 noun
noun
BrE
 
; NAmE
 
(especially US English sulfur dioxide)[uncountable](symbol SO2)
 
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a poisonous gas with a strong smell, that is used in industry and causes air pollution note at sulphur (1)
See the Oxford Advanced American Dictionary entry: sulphur dioxide