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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Casein  \Ca"se*in\,  n.  [Cf.  F.  cas['e]ine,  fr  L.  caseur  cheese. 
  Cf  {Cheese}.]  (Physiol.  Chem.) 
  A  proteid  substance  present  in  both  the  animal  and  the 
  vegetable  kingdom.  In  the  animal  kingdom  it  is  chiefly  found 
  in  milk,  and  constitutes  the  main  part  of  the  curd  separated 
  by  rennet;  in  the  vegetable  kingdom  it  is  found  more  or  less 
  abundantly  in  the  seeds  of  leguminous  plants.  Its  reactions 
  resemble  those  of  alkali  albumin.  [Written  also  {caseine}.]