Wordia - The Definition Of Organ
organ
noun, a). Also called: pipe organ a large complex musical keyboard instrument in which sound is produced by means of a number of pipes arranged in sets or stops, supplied with air from a bellows. The largest instruments possess three or more manuals and one pedal keyboard and have the greatest range of any instrument b) (as modifier)
From Collins
©HarperCollins 2008. Collins English Dictionary definition of organ