harmonium

1. Reed organ, usually pressure operated. In Europe the designation harmonium is preferred to the American designation reed organ. 2. One or more sets of organ reeds used as an accompaniment or even a solo voice in certain photoplayers, orchestrions, and other automatic musical instruments. Usually each rank of reeds is assigned the name of an organ pipe rank such as cello, diapason, clarinet, French horn, oboe, etc.