organ in WordNet English dictionary

1. (music) an electronic simulation of a pipe organ
   electric organ  electronic organ  Hammond organ  organ 
   
2. a free-reed instrument in which air is forced through the reeds by bellows
   harmonium  organ  reed organ 
   
3. 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
   organ  pipe organ 
   
4. a fully differentiated structural and functional unit in an animal that is specialized for some particular function
   organ 
   
5. a periodical that is published by a special interest group
   "the organ of the communist party"
   organ 
   
6. a government agency or instrument devoted to the performance of some specific function
   "The Census Bureau is an organ of the Commerce Department"
   organ