/ Dictionary / Index O organon: Meaning and Definition of Find definitions for: or•ga•non Pronunciation: (ôr'gu-non"), [key] — pl. -na -nons. an instrument of thought or knowledge. a system of rules or principles of demonstration or investigation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: organon (Thesaurus) organometallic organophosphate Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language