(n.) A musical instrument, resembling a small organ and especially designed for church music, in which the tones are produced by forcing air by means of a bellows so as to cause the vibration of free metallic reeds. It is now made with one or two keyboards, and has pedals and stops.

Hammond organ baroque organ calliope calliophone choralcelo electric organ electro-pneumatic organ hydraulic organ melodeon melodica orchestrelle organ organophone pipe organ reed organ seraphine steam organ symphonion tracker-action organ tubular-pneumatic organ vocalion