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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Diastase  \Di"a*stase\,  n.  [Gr.  ?  separation,  fr  ?,  ?  to  stand 
  apart;  dia`  through  +  ?,  ?,  to  stand  set:  cf  F.  diastase. 
  Cf  {Diastasis}.]  (Physiol.  Chem.) 
  A  soluble,  nitrogenous  ferment,  capable  of  converting  starch 
  and  dextrin  into  sugar. 
  Note:  The  name  is  more  particularly  applied  to  that  ferment 
  formed  during  the  germination  of  grain,  as  in  the 
  malting  of  barley;  but  it  is  also  occasionally  used  to 
  designate  the  amylolytic  ferment  contained  in  animal 
  fluids,  as  in  the  saliva.