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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Diacoustics  \Di`a*cous"tics\,  n.  [Cf.  F.  diacoustique.] 
  That  branch  of  natural  philosophy  which  treats  of  the 
  properties  of  sound  as  affected  by  passing  through  different 
  mediums;  --  called  also  {diaphonics}.  See  the  Note  under