Also called pipe organ. a musical instrument consisting of one or more sets of pipes sounded by means of compressed air, played by means of one or more keyboards, and capable of producing a wide range of musical effects.
any of various similar instruments, as a reed organ or an electronic organ.
Biology. a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task.
a newspaper, magazine, or other means of communicating information, thoughts, or opinions, especially in behalf of some organization, political group, or the like.
an instrument or means, as of action or performance: This committee will be the chief organ of administration.
Archaic. any of various musical instruments, especially wind, instruments.

before 1000; Middle English: musical instrument, pipe organ, organ of the body, tool (< Medieval Latin, Latin organum mechanical device, instrument) < Greek órganon implement, tool, bodily organ, musical instrument, akin to érgon work

interorgan, adjective
multiorgan, adjective

6. publication, journal, instrument, channel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
organ (ˈɔːɡən)
1.  a.  Also called: pipe organ a large complex musical keyboard instrument in which sound is produced by means of a number of pipes arranged in sets or stops, supplied with air from a bellows. The largest instruments possess three or more manuals and one pedal keyboard and have the greatest range of any instrument
 b.  (as modifier): organ pipe; organ stop; organ loft
2.  reed organ See also harmonica any instrument, such as a harmonium, in which sound is produced in this way
3.  electric organ short for electronic organ
4.  a fully differentiated structural and functional unit, such as a kidney or a root, in an animal or plant
5.  an agency or medium of communication, esp a periodical issued by a specialist group or party
6.  an instrument with which something is done or accomplished
7.  a euphemistic word for penis
[C13: from Old French organe, from Latin organum implement, from Greek organon tool; compare Greek ergein to work]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. organe, and O.Fr. orgene (12c.), both meaning "musical instrument," both from L. organa, pl. of organum, from Gk. organon "implement, musical instrument, organ of the body," lit. "that with which one works," from PIE *werg-ano-, from base *werg- "to do," related to Gk. ergon "work" and O.E. weorc
(see urge (v.)). Applied vaguely in late O.E. to musical instruments; sense narrowed by c.1386 to the modern musical instrument known by that name (involving pipes supplied with wind by a bellows and worked by means of keys), though Augustine (c.400) knew this as a specific sense of L. organa. The meaning "body part adapted to a certain function" is attested from 1392. Organist is first recorded 1591; organ-grinder is attested from 1806.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

organ or·gan (ôr'gən)
A differentiated part of the body that performs a specific function.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
organ   (ôr'gən)  Pronunciation Key 
A distinct part of an organism that performs one or more specialized functions. Examples of organs are the eyes, ears, lungs, and heart of an animal, and the roots, stems, and leaves of a plant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

organ definition

Part of a living thing, distinct from the other parts, that is adapted for a specific function. Organs are made up of tissues and are grouped into systems, such as the digestive system.

Note: The brain, liver, and skin are organs.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Bible Dictionary

Organ definition

some kind of wind instrument, probably a kind of Pan's pipes (Gen. 4:21; Job 21:12; Ps. 150:4), which consisted of seven or eight reeds of unequal length.

Easton's 1897 Bible Dictionary
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Example sentences
The head portion of the squid pokes out of a conical, rubbery structure called
  the mantle, which encloses the internal organs.
Even the two organs in the choir loft are decorated, with angels playing
Surgery was limited to simple operations on the extremities, where vital organs
  would not be exposed to infection.
Any minute, they thought, the metal would start slashing through his organs.
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