euphony

From French euphonie, from Ancient Greek εὐφωνία (euphōnía), from εὐ- (eu-, prefix meaning ‘good, well’) + φωνή (phōnḗ, “sound; (human) voice; discourse, speech”) (from Proto-Indo-European *bʰeh₂- (“to say, speak”)) + -ῐ́ᾱ (-ĭ́ā, suffix forming feminine abstract nouns). The English word is analysable as eu- +‎ -phony.