/ Dictionary / Index P pathogen: Meaning and Definition of Find definitions for: path•o•gen Pronunciation: (path'u-jun, -jen"), [key] — n. any disease-producing agent, esp. a virus, bacterium, or other microorganism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pathogen (Thesaurus) pathoformic pathogenesis Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language