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Definition of organ : 1. A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine.
2. A medium of communication between one person or body and another; as, the secretary of state is the organ of communication between the government and a foreign power; a newspaper is the organ of its editor, or of a party, sect, etc.
3. A natural part or structure in an animal or a plant, capable of performing some special action ( termed its function), which is essential to the life or well- being of the whole; as, the heart, lungs, etc., are organs of animals; the root, stem, foliage, etc., are organs of plants.
4. A wind instrument containing numerous pipes of various dimensions and kinds, which are filled with wind from a bellows, and played upon by means of keys similar to those of a piano, and sometimes by foot keys or pedals; -- formerly used in the plural, each pipe being considired an organ.
5. An instrument or medium by which some important action is performed, or an important end accomplished; as, legislatures, courts, armies, taxgatherers, etc., are organs of government.
6. To supply with an organ or organs; to fit with organs; to organize.

Synonyms:

pipe organ, musical instrument, melodeon, agency, way, agent, medium, arm, rag, division, instrumentality, means, mean, wing, electric organ, department, reed organ, mechanism, part, device, harmonium, electronic organ, instrument, instrumentation, branch, intermediary, tool, Hammond organ, gland

English horn, harpsichord, classical guitar, trumpet, electric guitar, guitar, bass, keyboard, clarinet, violincello, alto saxophone, French horn, bassoon, cello, viola, recorder, fiddle, violin, harp, piano, flute, piccolo, harmonica, banjo, electric piano, drum, saxophone, tenor saxophone, oboe, horn, trombone

gazette, newspaper, propaganda, post, report, dissemination, bulletin, newsletter, promulgation, advertisement, publication, herald, newsmagazine, handbill, brief, notice, circular, promotion, journalism, commercial, journal, review, broadcast, announcement, periodical

Usage examples:

• That wretched organ man is always haunting this house, and you are constantly giving him money. - "Lady Maude's Mania", George Manville Fenn.
• Let us record this, so that no one may think it remarkable that the buffet struck that delicate organ instead of any other region of his face. - "Maximina", Armando Palacio Valdés.
• It is found only in the luminous organ of Cypridina hilgendorfii, not in non- luminous parts and not in a non- luminous species of Cypridina closely related to hilgendorfii. - "The Nature of Animal Light", E. Newton Harvey.