/ Dictionary / Index P pyo-: Meaning and Definition of Find definitions for: pyo- Pronunciation: [key] a combining form meaning “pus,” used in the formation of compound words: pyogenesis. PYO Pronunciation: [key] pick your own. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pynchon pyogenesis Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language