[ noun ] a bass horn (brass wind instrument) that is the tenor of the tuba family <noun.artifact>
Euphonium \Eu*pho"ni*um\, n. [NL. See {Euphony}.] (Mus.) A bass instrument of the saxhorn family.
His three pupils today are playing Haydn, Horovitz and Cherubini on trumpet, euphonium, and French horn (7.30 BBC2).
On to "His Eye Is on The Sparrow," a hymn of reverence featuring co-leader Jim Mesich, an environmental consultant, on his euphonium, a higher-pitched cousin of Newberger's plumbing.