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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Diacid  \Di*ac"id\,  a.  [Pref.  di-  +  acid.]  (Chem.) 
  Divalent;  --  said  of  a  base  or  radical  as  capable  of 
  saturating  two  acid  monad  radicals  or  a  dibasic  acid.  Cf 
  {Dibasic},  a.,  and  {Biacid}.