organon

noun, plural or·ga·na [awr-guh-nuh] /ˈɔr gə nə/, or·ga·nons.

1. an instrument of thought or knowledge.
2. Philosophy. a system of rules or principles of demonstration or investigation.

noun plural organa (ˈɔːɡənə), -nons, -na or -nums Epistemology

1. a system of logical or scientific rules, esp that of Aristotle
2. archaic a sense organ, regarded as an instrument for acquiring knowledge

n. pl. or•ga•nons

1. An organ.
2. A set of principles for use in scientific investigation.