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trioxide  n any oxide that contains three oxygen atoms per molecule 
sulphur trioxide, SO3  

arsenic trioxide    n 
a white poisonous powder used in the manufacture of glass and as an insecticide, rat poison, and weedkiller. Formula: As2O3, (Also called)  arsenic 
sulphur trioxide    n 
a white corrosive substance existing in three crystalline forms of which the stable (alpha-) form is usually obtained as silky needles. It is produced by the oxidation of sulphur dioxide, and is used in the sulphonation of organic compounds. Formula: SO3, (Systematic name)  sulphur(VI) oxide