Usually means: Strong acid, sulfur-oxygen compound.
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We found 9 dictionaries that define the word sulphur trioxide:

General (7 matching dictionaries)
  1. sulphur trioxide: Collins English Dictionary
  2. sulphur trioxide: Wordnik
  3. sulphur trioxide: Wiktionary
  4. Sulphur trioxide: Dictionary.com
  5. Sulphur trioxide: Wikipedia, the Free Encyclopedia
  6. sulphur trioxide: FreeDictionary.org
  7. sulphur trioxide: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Sulphur trioxide: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (Sulphur trioxide)

noun:  (inorganic chemistry, British) Alternative spelling of sulfur trioxide [(inorganic chemistry) A corrosive liquid, SO₃, which forms sulfuric acid on contact with water; made commercially by the oxidation of sulfur dioxide.]

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