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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Allantoin  \Al*lan"to*in\,  n.  (Chem.) 
  A  crystalline,  transparent,  colorless  substance  found  in  the 
  allantoic  liquid  of  the  fetal  calf;  --  formerly  called 
  allantoic  acid  and  amniotic  acid.