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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Bryonin  \Bry"o*nin\,  n.  (Chem.) 
  A  bitter  principle  obtained  from  the  root  of  the  bryony 
  ({Bryonia  alba}  and  {B.  dioica}).  It  is  a  white,  or  slightly 
  colored,  substance,  and  is  emetic  and  cathartic.