{Harmonic proportion}. See under {Proportion}.
{Harmonic series} or {progression}. See under {Progression}.
{Spherical harmonic analysis}, a mathematical method,
sometimes referred to as that of Laplace's Coefficients,
which has for its object the expression of an arbitrary,
periodic function of two independent variables, in the
proper form for a large class of physical problems,
involving arbitrary data, over a spherical surface, and
the deduction of solutions for every point of space. The
functions employed in this method are called spherical
harmonic functions. --Thomson & Tait.
{Harmonic suture} (Anat.), an articulation by simple
apposition of comparatively smooth surfaces or edges, as
between the two superior maxillary bones in man; -- called
also {harmonic}, and {harmony}.
{Harmonic triad} (Mus.), the chord of a note with its third
and fifth; the common chord.
Harmonic twang! of leather, horn, and brass. --Pope.
2. (Mus.) Relating to harmony, -- as melodic relates to
melody; harmonious; esp., relating to the accessory sounds
or overtones which accompany the predominant and apparent
single tone of any string or sonorous body.
3. (Math.) Having relations or properties bearing some
resemblance to those of musical consonances; -- said of
certain numbers, ratios, proportions, points, lines.
motions, and the like.
{Harmonic interval} (Mus.), the distance between two notes of
a chord, or two consonant notes.
{Harmonical mean} (Arith. & Alg.), certain relations of
numbers and quantities, which bear an analogy to musical
consonances.