
1) Instrument of thought 2) System 3) System of rules 4) Work by Aristotle
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https://www.crosswordclues.com/clue/organon

The Organon (Greek: Ὄργανον, meaning `instrument, tool, organ`) is the standard collection of Aristotle`s six works on logic. The name Organon was given by Aristotle`s followers, the Peripatetics. They are as follows: == Constitution of the texts == The order of the works is not chronological (which is now hard to determine) but was de...
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http://en.wikipedia.org/wiki/Organon

method of investigation; logical technique or system
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http://phrontistery.info/o.html

• (n.) Alt. of Organum
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http://thinkexist.com/dictionary/meaning/organon/

(from the article `Aristotle`) ...the Topics, the Sophistical Refutations, and a treatise on scientific method, the Posterior Analytics, were grouped together in a collection known ... Aristotle`s logical writings comprise six works, known collectively as the Organon (`Tool`). The significance of the name is that logic, for .....
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http://www.britannica.com/eb/a-z/o/29

Synonym: organ. ... Origin: G. Organ ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Or'ga·non Or'ga*num noun [ New Latin organon , Latin organum . See Organ .] An organ or instrument; hence, a method by which philosophical or scientific investigation may be conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, as the title...
Found on http://www.encyclo.co.uk/webster/O/31
Type: Term Pronunciation: ōr′gă-non, ōr′gă-nă Synonyms: organ
Found on http://www.medilexicon.com/medicaldictionary.php?t=63280
[n] - a system of principles for philosophic or scientific investigations
Found on http://www.webdictionary.co.uk/definition.php?query=organon
organon 1. In medicine, A somewhat independent part of the body that performs a special function. 2. A set of principles for use in philosophical or scientific investigation.
Found on http://www.wordinfo.info/words/index/info/view_unit/1505/2
noun a system of principles for philosophic or scientific investigations; an instrument for acquiring knowledge
Found on https://www.encyclo.co.uk/local/20974
(Gr. organon) The title traditionally given to the body of Aristotle's logical treatises. The designation appears to have originated among the Peripatetics after Aristotle's time, and expresses their view that logic is not a part of philosophy (as the Stoics maintained) but rather the instrument (organon) of philosophical inquiry. See Aristotelian....
Found on https://www.encyclo.co.uk/local/21203
an instrument of thought or knowledge. · a system of rules or principles of demonstration or investigation.
Found on https://www.infoplease.com/dictionary/organon
No exact match found.