Definition of euphonium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//juːˈfəʊniəm//
; NAmE NAmE//juːˈfoʊniəm//
Musical instruments
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a large brass musical instrument like a tuba See related entries: Musical instruments Word Origin mid 19th cent.: from Greek euphōnos ‘having a pleasing sound’ + -ium.
See the Oxford Advanced American Dictionary entry: euphonium