/ Dictionary / Index P pyelonephrosis: Meaning and Definition of Find definitions for: py•e•lo•ne•phro•sis Pronunciation: (pī"u-lō-nu-frō'sis, pī-el"ō-), [key] — n. Pathol. any disease of the kidney and its pelvis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyelonephritis pyemia 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