noun \-ˈnef-rəs, -ˌräs\
plural meta·neph·roi \-ˌri\

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

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