/ Dictionary / Index P panic disorder: Meaning and Definition of Find definitions for: pan'ic disor"der Pronunciation: [key] — Psychiatry. Psychiatry. a disorder in which inappropriate, intense apprehension and physical symptoms of fear occur so frequently as to produce significant impairment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. panic button panicle Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language