/ Dictionary / Index I idiopathic: Meaning and Definition of Find definitions for: id•i•o•path•ic Pronunciation: (id"ē-u-path'ik), [key] — adj. Pathol. of unknown cause, as a disease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: idiopathic (Thesaurus) -idion idiopathy Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language