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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Juglone  \Ju"glone\,  n.  [L.  juglans  the  walnut  +  -one.]  (Chem.) 
  A  yellow  crystalline  substance  resembling  quinone,  extracted 
  from  green  shucks  of  the  walnut  ({Juglans  regia});  --  called 
  also  {nucin}.