Definition of: organ

(ôr′gən) noun
1. A musical wind instrument consisting of a collection of pipes made to sound by means of compressed air from bellows and played upon by means of keys: also pipe organ.
2. An electronic musical instrument not employing pipes or wind, designed to give the sounds and timbres of a pipe organ.
3. A musical instrument resembling or having some mechanism resembling the pipe organ: a reed organ; a barrel organ.
4. Any part of an organism, plant, or animal performing some definite function: the digestive organs.
5. An instrument or agency for communication of the views of a person or party; especially, a newspaper or periodical published in the interest of some political party or religious denomination. [Fusion of OE organa and OF organe, both <L organum an instrument, engine, organ <Gk. organon a tool, a musical instrument]