1.  organ(n = noun.body) - a fully differentiated structural and functional unit in an animal that is specialized for some particular function;
is a kind of body part
has parts: lobe
has particulars: ovipositor, siphon, syphon, comb-plate, ctene, wing, foot, invertebrate foot, sucker, stinger, contractile organ, contractor, anlage, primordium, vital organ, vitals, effector, external organ, internal organ, viscus, receptor, sense organ, sensory receptor, clapper, glossa, lingua, tongue, organ of speech, speech organ, vocal organ, crystalline lens, lens, lens of the eye, gland, secreter, secretor, secretory organ, cell organ, cell organelle, organelle, end organ, reproductive organ, sex organ, target organ, taret organ, erectile organ
Derived form adjective organic₃

2.  organ(n = noun.group) - a government agency or instrument devoted to the performance of some specific function; "The Census Bureau is an organ of the Commerce Department"
is a kind of agency, authority, bureau, federal agency, government agency, office

3.  organ(n = noun.artifact) electric organ, electronic organ, hammond organ - (music) an electronic simulation of a pipe organ;
is a kind of electronic instrument, electronic musical instrument
Derived form noun organist₁

4.  organ(n = noun.communication) - a periodical that is published by a special interest group; "the organ of the communist party"
is a kind of periodical
has particulars: house organ

5.  organ(n = noun.artifact) pipe organ - 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;
is a kind of keyboard instrument, wind, wind instrument
has parts: keyboard, organ pipe, pipe, pipework, foot lever, foot pedal, pedal, treadle, clavier, fingerboard, piano keyboard, stop
Derived form noun organist₁

6.  organ(n = noun.artifact) harmonium, reed organ - a free-reed instrument in which air is forced through the reeds by bellows;
is a kind of free-reed instrument
Derived form noun organist₁

1.  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. [1913 Webster]

2.  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. [1913 Webster]
" In animals the organs are generally made up of several tissues, one of which usually predominates, and determines the principal function of the organ. Groups of organs constitute a system. See System." [1913 Webster]

3.  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. [1913 Webster]

4.  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. A newsletter distributed within an organization is often called its house organ. [1913 Webster]

5.  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 considered an organ. [1913 Webster]
"The deep, majestic, solemn organs blow." [1913 Webster]
"The merry orgon . . . that in the church goon [go]." [1913 Webster]

   To supply with an organ or organs; to fit with organs; to organize. [1913 Webster]
"Thou art elemented and organed for other apprehensions." [1913 Webster]

organ, n.
1 a a usu. large musical instrument having pipes supplied with air from bellows, sounded by keys, and distributed into sets or stops which form partial organs, each with a separate keyboard (choir organ; pedal organ). b a smaller instrument without pipes, producing similar sounds electronically. c a smaller keyboard wind instrument with metal reeds; a harmonium. d = barrel-organ.
2 a a usu. self-contained part of an organism having a special vital function (vocal organs; digestive organs). b esp. joc. the penis.
3 a medium of communication, esp. a newspaper, sectarian periodical, etc.
4 archaic a professionally trained singing voice.
5 Phrenol. archaic a region of the brain held to be the seat of a particular faculty.

Idiom:
organ-blower a person or mechanism working the bellows of an organ. organ-grinder the player of a barrel-organ. organ-loft a gallery in a church or concert-room for an organ. organ of Corti see CORTI. organ-pipe any of the pipes on an organ. organ-screen an ornamental screen usu. between the choir and the nave of a church, cathedral, etc., on which the organ is placed. organ-stop
1 a set of pipes of a similar tone in an organ.
2 the handle of the mechanism that brings it into action.

Etymology:
ME f. OE organa & OF organe, f. L organum f. Gk organon tool

N  voice, vocality, organ, lungs, bellows, good voice, fine voice, powerful voice, musical voice, intonation, tone of voice, vocalization, cry, strain, utterance, prolation, exclamation, ejaculation, vociferation, ecphonesis, enunciation, articulation, articulate sound, distinctness, clearness, of articulation, stage whisper, delivery, accent, accentuation, emphasis, stress, broad accent, strong accent, pure accent, native accent, foreign accent, pronunciation, homonym, orthoepy, cacoepy, euphony, gastriloquism, ventriloquism, ventriloquist, polyphonism, polyphonist, phonology, vocal, phonetic, oral, ejaculatory, articulate, distinct, stertorous, euphonious, how sweetly sounds the voice of a good woman, the organ of the soul, thy voice is a celestial melody.

N  instrument, machinery, mechanism, engineering, instrument, organ, tool, implement, utensil, machine, engine, lathe, gin, mill, air engine, caloric engine, heat engine, gear, tackle, tackling, rig, rigging, apparatus, appliances, plant, materiel, harness, trappings, fittings, accouterments, barde, equipment, equipmentage, appointments, furniture, upholstery, chattels, paraphernalia, mechanical powers, lever, leverage, mechanical advantage, crow, crowbar, handspike, gavelock, jemmy, jimmy, arm, limb, wing, oar, paddle, pulley, wheel and axle, wheelwork, clockwork, wheels within wheels, pinion, crank, winch, cam, pedal, capstan, wheel, inclined plane, wedge, screw, spring, mainspring, can hook, glut, heald, heddle, jenny, parbuckle, sprag, water wheel, handle, hilt, haft, shaft, heft, shank, blade, trigger, tiller, helm, treadle, key, turnscrew, screwdriver, knocker, hammer, edge tool, borer, vice, teeth, nail, rope, peg, support, spoon, arms, oar, cardiograph, recapper, snowplow, tenpenny, votograph, instrumental, mechanical, machinal, brachial.

N  musical instruments, band, string-band, brass-band, orchestra, orchestrina, monochord, polychord, harp, lyre, lute, archlute, mandola, mandolin, mandoline, guitar, zither, cither, cithern, gittern, rebeck, bandurria, bandura, banjo, bina, vina, xanorphica, viol, violin, fiddle, kit, viola, viola d'amore, viola di gamba, tenor, cremona, violoncello, bass, bass viol, base viol, theorbo, double base, contrabasso, violone, psaltery, bow, fiddlestick, piano, pianoforte, harpsichord, clavichord, clarichord, manichord, clavier, spinet, virginals, dulcimer, hurdy-gurdy, vielle, pianino, Eolian harp, organ, harmonium, harmoniphon, American organ, barrel organ, hand organ, accordion, seraphina, concertina, humming top, flute, fife, piccolo, flageolet, clarinet, claronet, basset horn, corno di bassetto, oboe, hautboy, cor Anglais, corno Inglese, bassoon, double bassoon, contrafagotto, serpent, bass clarinet, bagpipes, union pipes, musette, ocarina, Pandean pipes, reed instrument, sirene, pipe, pitch-pipe, sourdet, whistle, catcall, doodlesack, harmoniphone, horn, bugle, cornet, cornet-a-pistons, cornopean, clarion, trumpet, trombone, ophicleide, French horn, saxophone, sax, buglehorn, saxhorn, flugelhorn, althorn, helicanhorn, posthorn, sackbut, euphonium, bombardon tuba, cymbal, bell, gong, tambour, tambourine, tamborine, drum, tom-tom, tabor, tabret, tabourine, taborin, side drum, kettle drum, timpani, tympani, tymbal, timbrel, castanet, bones, musical glasses, musical stones, harmonica, sounding-board, rattle, tam-tam, zambomba, reed, tuning fork, triangle, Jew's harp, musical box, harmonicon, xylophone, sordine, sordet, sourdine, sourdet, mute, (iv) PERCEPTION OF SOUND.

american organ, barrel organ, bojanus organ, cell organ, contractile organ, electric organ, electronic organ, end organ, erectile organ, excretory organ, external organ, female genital organ, female internal reproductive organ, genital organ, grind organ, gustatory organ, hammond organ, hand organ, house organ, internal organ, lateral line organ, male genital organ, male internal reproductive organ, mouth organ, olfactory organ, organ donor, organ loft, organ of corti, organ of hearing, organ of speech, organ pipe, organ stop, organ transplant, pipe organ, plant organ, reed organ, reproductive organ, respiratory organ, rosenm'81ller's organ, secretory organ, sense organ, sex organ, speech organ, steam organ, street organ, taret organ, target organ, urinary organ, vital organ, vocal organ