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Webster 1913 Edition

Adj.

[Pref.

-eu + harmonic

(Mus.)

Producing mathematically perfect harmony or concord; sweetly or perfectly harmonious.

Adj.

[Gr. well, and harmonic.]

Producing harmony or concordant sounds; as the euharmonic organ.

euharmonic ‎(comparative more euharmonic, superlative most euharmonic)

(rare) Pleasingly melodious or harmonious — applied especially to the euharmonic organ invented by Henry Ward Poole (1825-1890), in whose design mathematical principles of harmony were employed.