organ

(noun) a fully differentiated structural and functional unit in an animal that is specialized for some particular function.

(noun) a government agency or instrument devoted to the performance of some specific function. Example: "The census bureau is an organ of the commerce department."

(noun) (music) an electronic simulation of a pipe organ. Synonyms: electric organ, electronic organ, Hammond organ.

(noun) a periodical that is published by a special interest group. Example: "The organ of the communist party."

(noun) 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: pipe organ.

(noun) a free-reed instrument in which air is forced through the reeds by bellows. Synonyms: harmonium, reed organ.