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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Guanidine  \Gua"ni*dine\,  n.  (Physiol.  Chem.) 
  A  strongly  alkaline  base,  {CN3H5},  formed  by  the  oxidation  of 
  guanin,  and  also  obtained  combined  with  methyl  in  the 
  decomposition  of  creatin.  Boiled  with  dilute  sulphuric  acid, 
  it  yields  urea  and  ammonia.