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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Anharmonic  \An`har*mon"ic\,  a.  [F.  anharmonique  fr  Gr  'an 
  priv.  +  ?  harmonic.]  (Math.) 
  Not  harmonic. 
  {The  anharmonic  function}  or  {ratio}  of  four  points  abcd  on  a 
  straight  line  is  the  quantity  (ac/ad):(bc/bd),  where  the 
  segments  are  to  be  regarded  as  plus  or  minus,  according  to 
  the  order  of  the  letters.