1. 
   Persulphate
   Per·sul'phate noun (Chemistry) A sulphate of the peroxide of any base. [ R.]
   Found op http://www.encyclo.co.uk/webster/P/63
   
   
2. 
   persulphate
   <chemistry> A sulphate of the peroxide of any base. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?persulphate
   
   
3. 
   Persulphate
   • (n.) A sulphate of the peroxide of any base.
   Found op http://thinkexist.com/dictionary/meaning/persulphate/
   
   
4. 
   Persulphate
   A persulphate is a salt of persulphuric acid. The persulphates have strong oxidizing characteristics useful in industry. Ammonium persulphate was formerly used for reducing the density of photographic negatives.
   Found op http://www.probertencyclopaedia.com/browse/GP.HTM
   
   

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