/ Dictionary / Index P pyrogen: Meaning and Definition of Find definitions for: py•ro•gen Pronunciation: (pī'ru-jun, -jen"), [key] — n. a substance, as a thermostable bacterial toxin, that produces a rise in temperature in a human or animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrogen (Thesaurus) pyrogallol pyrogenic Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language