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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Merriam-Webster unabridged
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Time Traveler for metanephros
The first known use of metanephros was in 1877
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