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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Emodin  \Em"o*din\,  n.  (Chem.) 
  An  orange-red  crystalline  substance,  {C15H10O5},  obtained 
  from  the  buckthorn,  rhubarb,  etc.,  and  regarded  as  a 
  derivative  of  anthraquinone;  --  so  called  from  a  species  of 
  rhubarb  ({Rheum  emodei}).