Sulfonium Definition
 sŭl-fōnē-əm 
    noun
  
 A monovalent radical containing three alkyl radicals and one atom of sulfur, as the triethyl sulfonium radical (C2H5)3S.
 Webster's New World 
Origin of Sulfonium
- sulf(o)– (amm)onium - From American Heritage Dictionary of the English Language, 5th Edition 
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