Harmonium

Harmonium, har-mō′ni-um, n. a reed-organ, esp. one in which the air is compressed in the bellows and driven thence through the reeds.—ns. Harmon′ica, the musical glasses—an instrument invented by Franklin, the sounds of which were produced from bell-shaped glasses placed on a framework that revolved on its centre, while the rims were touched by the moistened finger: a musical instrument consisting of a series of glass or metal plates played by striking with a small mallet: a mouth-organ or harmonicon; Harmon′icon, a mouth-organ: an acoustic apparatus by which a musical note is evolved when a long dry tube, open at both ends, is held over a jet of burning hydrogen; Harmon′iphone, a musical instrument played with a keyboard, in which the sounds are produced by reeds set in a tube, and vibrating under pressure from the breath; Harmō′niumist, one who plays the harmonium; Harmon′ograph, an instrument for tracing curves representing sonorous vibrations; Harmonom′eter, one for measuring the harmonic relations of sounds.