出典:Wiktionary
From euphonical + -ous (suffix forming adjectives denoting possession または presence of a quality, commonly in abundance).[1] Euphonical is derived from euphonic + -al (suffix forming adjectives with the sense ‘of または pertaining to’);[2] with euphonic from euphony + -ic (suffix forming adjectives with the sense ‘of または pertaining to’),[3] and euphony borrowed 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 (-íā, suffix forming feminine abstract nouns).[4]
euphonious (comparative more euphonious, superlative most euphonious)