/ Dictionary / Index P pyothorax: Meaning and Definition of Find definitions for: py•o•tho•rax Pronunciation: (pī"ō-thôr'aks, -thōr'-), [key] — n. Pathol. empyema. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyosis pyoureter Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language