/ Dictionary / Index P pyrogenous: Meaning and Definition of Find definitions for: py•rog•e•nous Pronunciation: (pī-roj'u-nus), [key] — adj. Geol. pyrogenic (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrogenous (Thesaurus) pyrogenic pyrognostics 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