metanephros

meta·neph·ros

noun \-ˈnef-rəs, -ˌräs\

plural meta·neph·roi \-ˌrȯi\

Definition of METANEPHROS

: either member of the final and most caudal pair of the three successive pairs of vertebrate renal organs that functions as a permanent adult kidney in reptiles, birds, and mammals but is not present at all in lower forms—compare mesonephros, pronephros