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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Castoreum  \Cas*to"re*um\,  n.  [L.  See  {Castor}.] 
  A  peculiar  bitter  orange-brown  substance,  with  strong, 
  penetrating  odor,  found  in  two  sacs  between  the  anus  and 
  external  genitals  of  the  beaver;  castor;  --  used  in  medicine 
  as  an  antispasmodic,  and  by  perfumers.