ureteroneopyelostomy u·re·ter·o·ne·o·py·e·los·to·my (y&oobreve;-rē'tə-rō-nē'ō-pī'ə-lŏs'tə-mē) n. Surgical reimplantation of the ureter into the pelvis of the kidney. Also called ureteropyeloneostomy.