noun. a bass horn (brass wind instrument) that is the tenor of the tuba family.
1. Noun, singular or mass The baritone is so nearly the same as a euphonium that even musicians are not sure of the difference. 2. Adjective Six to eight of those courses would be in euphonium performance, as well as eight courses in music theory, four courses in music history and a group music course. 3. Verb, past participle The University of North Texas and the Virginia Commonwealth University have euphonium studios.