- a musical keyboard instrument of the reed organ family, in which air from pedal-operated bellows causes the reeds to vibrate
WordReference Random House Unabridged Dictionary of American English © 2026
har•mo•ni•um
(här mō′nē əm),USA pronunciation n.
- Music and Dancean organlike keyboard instrument with small metal reeds and a pair of bellows operated by the player's feet.
- Latinization of Greek harmónion, neuter of harmónios harmonious 1840–50
Collins Concise English Dictionary © HarperCollins Publishers::
harmonium /hɑːˈməʊnɪəm/ n
'harmonium' also found in these entries (note: many are not synonyms or translations):