noun Etymology: Greek euphōnos + English -ium (as in harmonium) Date: 1865 a brass instrument smaller than but resembling a tuba and having a range from B flat below the bass staff upward for three octaves
EUPHONIUM
Meaning of EUPHONIUM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012