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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Guanin  \Gua"nin\,  n.  (Physiol.  Chem.) 
  A  crystalline  substance  ({C5H5N5O})  contained  in  guano.  It  is 
  also  a  constituent  of  the  liver,  pancreas,  and  other  glands 
  in  mammals.