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