1. A fully differentiated structural and functional unit in an animal that is specialized for some particular function (synset 105305022)
  2. A government agency or instrument devoted to the performance of some specific function (synset 108366277)
    "The Census Bureau is an organ of the Commerce Department"
  3. (music) an electronic simulation of a pipe organ (synset 103278462)
  4. A periodical that is published by a special interest group (synset 106607260)
    "the organ of the communist party"
  5. 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 (synset 103859585)
  6. A free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows (synset 103499638)

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