Inflammation of the renal pelvis.
- ‘A urinary infection that involves the urine collecting system of the kidney is called pyelitis.’
- ‘It has a wide range of uses including the common cold, heatstroke, acute gastroenteritis, pyelitis, and gallbladder disorders.’
- ‘I find Professor Taylor's hypothesis that Miss Rossiter was probably suffering the symptoms of pyelitis on that date most unconvincing.’
Mid 19th century: from Greek puelos trough, basin + -itis.