anharmonic ratio

1 definition found

anharmonic ratio - Collaborative International Dictionary of English v.0.48 :

  Anharmonic \An`har*mon"ic\, a. [F. anharmonique, fr. Gr. 'an
     priv. + ? harmonic.] (Math.)
     Not harmonic.
     [1913 Webster]
  
     The anharmonic function or anharmonic 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.
        [1913 Webster]