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8 Wintry Words to Defrost Your Vocabulary

sulphur trioxide

noun
1.
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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