a brass musical instrument with four valves; the tenor of the tuba family. It is used mainly in brass bands
WordReference Random House Unabridged Dictionary of American English © 2025
eu•pho•ni•um
(yo̅o̅ fō′nē əm),USA pronunciation n.
- Music and Dancea brass musical instrument similar to the baritone tuba but somewhat smaller, with a wider bore and mellower tone, and often having a second bell.
- euph(ony) + (harm)onium 1860–65
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