keyboard instrument resembling the organ in sound
• (n.) An instrument resembling the organ in tine and the upright piano in form. It is characterized by great strength and sweetness of tone.
Eu'pho·non noun [ See Euphony .] (Mus.) An instrument resembling the organ in tone and the upright piano in form. It is characterized by great strength and sweetness of tone. 
The euphonon is a musical instrument resembling the organ in tone and the upright piano in form. It is characterised by great strength and sweetness of tone.