sulphur trioxide
noun
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: SO 3
Systematic name: sulphur(VI) oxide
Words nearby sulphur trioxide
sulphonyl,
sulphur,
sulphur butterfly,
sulphur dioxide,
sulphur springs,
sulphur trioxide,
sulphur tuft,
sulphur-bottom,
sulphur-crested cockatoo,
sulphur-flower,
sulphurate