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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Cinchonidine  \Cin*chon"i*dine\,  n.  [From  {Cinchona}.]  (Chem.) 
  One  of  the  quinine  group  of  alkaloids,  found  especially  in 
  red  cinchona  bark.  It  is  a  white  crystalline  substance, 
  {C19H22N2O},  with  a  bitter  taste  and  qualities  similar  to 
  but  weaker  than  quinine;  --  sometimes  called  also