Definition of organ

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or·gan    (ôrgn) KEY 

NOUN:

1. Music
   1. An instrument consisting of a number of pipes that sound tones when supplied with air and a keyboard that operates a mechanism controlling the flow of air to the pipes. Also called pipe organ.
   2. Any one of various other instruments, such as the electronic organ, that resemble a pipe organ either in mechanism or sound.
2. Biology A differentiated part of an organism, such as an eye, wing, or leaf, that performs a specific function.
3. An instrument or agency dedicated to the performance of specified functions: The FBI is an organ of the Justice Department.
4. An instrument or a means of communication, especially a periodical issued by a political party, business firm, or other group.

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ETYMOLOGY:
Middle English, from Old French organe, and from Old English organe both from Latin organum, tool, instrument, from Greek organon; see werg- in Indo-European roots