(music) One of the departments of a cathedral organ, standing behind the great organ, having its tones less powerful, and more suited to accompanying the voice.

plural of choir organ

(music) A large harmonium used instead of a pipe organ.

plural of organ harmonium

plural of organ system

(biology) A group of organs that work together as a biological system to perform one or more functions.

plural of swell organ

(music) barrel organ

plural of roller organ

An ornamental screen on which a secondary organ is sometimes placed in cathedrals.