/ Dictionary / Index P pathological: Meaning and Definition of Find definitions for: path•o•log•i•cal Pronunciation: (path"u-loj'i-kul), [key] — adj. of or pertaining to pathology. caused by or involving disease; morbid. caused by or evidencing a mentally disturbed condition: a pathological liar. dealing with diseases: a pathological casebook. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pathological (Thesaurus) pathol. pathologic anatomy Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language