Etymology
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organ (n.)

fusion of late Old English organe, and Old French orgene (12c.), both meaning "musical instrument," both from Latin organa, plural of organum "a musical instrument," from Greek organon "implement, tool for making or doing; musical instrument; organ of sense, organ of the body," literally "that with which one works," from PIE *werg-ano-, from root *werg- "to do."

Applied vaguely in late Old English to musical instruments; by late 14c. the sense of the word (used in both singular and plural form) narrowed to the large, complicated musical instrument now known by that name (involving pipes sounded by means of compressed air supplied by a bellows and worked by means of keys), though Augustine (c. 400) knew this as a specific sense of Latin organa.

The biological meaning "body part of a human or animal adapted to a certain function" is attested from late 14c., from a Medieval Latin sense of Latin organum. From early 15c. as "a tool, an instrument." The broad, etymological sense of "that which performs some function" is attested in English from 1540s.  By 1788 as "a medium, an instrument of communication." Organ-grinder, "strolling musician who 'grinds' music on a barrel-organ" is attested by 1803.

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Definitions of organ

organ (n.)
a fully differentiated structural and functional unit in an animal that is specialized for some particular function;
organ (n.)
a government agency or instrument devoted to the performance of some specific function;
The Census Bureau is an organ of the Commerce Department
organ (n.)
(music) an electronic simulation of a pipe organ;
Synonyms: electric organ / electronic organ / Hammond organ
organ (n.)
a periodical that is published by a special interest group;
the organ of the communist party
organ (n.)
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;
Synonyms: pipe organ
organ (n.)
a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows;
Synonyms: harmonium / reed organ
From wordnet.princeton.edu