Phosphonium Definition
 fŏs-fōnē-əm 
    noun
  
 The monovalent radical PH4, which is related to PH3 as the ammonium radical NH4 is related to NH3
 Webster's New World 
Origin of Phosphonium
phosph(o)– (amm)onium
From American Heritage Dictionary of the English Language, 5th Edition
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