1. (noun)organ a fully differentiated structural and functional unit in an animal that is specialized for some particular function Synonyms: pipeorgan, reedorgan, electricorgan, electronic organ, harmonium
5. (noun)organ, pipe organ wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard Synonyms: pipeorgan, reedorgan, electricorgan, organ, electronic organ, harmonium