[yoo-foh-nee-uh
m] 
| 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. |
| eu·pho·ni·um (yōō-fō'nē-əm) n. A brass wind instrument similar to the tuba but having a somewhat higher pitch and a mellower sound. [From Greek euphōnos, sweet-voiced; see euphony.] |