noun eu·pho·ni·um \yü-ˈfō-nē-əm\

Definition of euphonium

  1. :  a brass instrument smaller than but resembling a tuba and having a range from B flat below the bass staff upward for three octaves

Origin and Etymology of euphonium

Greek euphōnos + English -ium (as in harmonium)

First Known Use: 1865

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