Hypertext Webster Gateway: "Anharmonic"
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.
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