from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. 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.
from the GNU version of the Collaborative International Dictionary of English
- adj. Producing mathematically perfect harmony or concord; sweetly or perfectly harmonious.
from The Century Dictionary and Cyclopedia
- Producing perfectly concordant sounds, as opposed to sounds produced by tempered instruments.
eu- + harmonic (Wiktionary)