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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.