a brass musical instrument similar to the baritone tuba but somewhat smaller, with a wider bore and mellower tone, and often having a second bell.

1860–65; euph(ony) + (harm)onium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
euphonium (juːˈfəʊnɪəm)
a brass musical instrument with four valves; the tenor of the tuba family. It is used mainly in brass bands
[C19: New Latin, from euph(ony + harm)onium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for euphonium
He later joined castle on stage playing the euphonium in a musical duet.
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