euphonium

American  

[yoo-foh-nee-uhm] / yuˈfoʊ ni əm /

noun

1. 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.

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euphonium British  

/ juːˈfəʊnɪəm /

noun

1. a brass musical instrument with four valves; the tenor of the tuba family. It is used mainly in brass bands

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Etymology

Origin of euphonium

First recorded in 1860–65; euph(ony) + (harm)onium

Example Sentences

Carys's 11-year-old sister, Eliza, who plays the euphonium, will also perform at the Abbey.

From BBC • Dec. 5, 2025

Recall that lone euphonium and piano at the beginning and end of Jackie DeShannon’s recording of “What the World Needs Now.”

From Washington Post • Feb. 10, 2023

At Woodbridge High, he was the captain of the hockey team, president of the Latin club and a player of the trombone and the euphonium in the band, his first formal musical training.

From Los Angeles Times • Sep. 5, 2019

The basement is filled with Spils’ collection of musical instruments, including a euphonium and a melaphone, which is a French horn that operates like a trumpet.

From Seattle Times • Mar. 31, 2017

The Ring also called for the invention of subsequently dubbed 'Wagner tubas, a hybrid that combined elements of the French horn, trombone and euphonium.

From "The Story of Music" by Howard Goodall