metanephros
American Heritage Dictionary:
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met·a·neph·ros
(mĕt'ə-nĕf'rŏs') 
n.
The third and final excretory organ that develops in a vertebrate embryo. In birds, reptiles, and mammals it replaces the mesonephros as the functional excretory organ and develops into the adult kidney.
n.
The third and final excretory organ that develops in a vertebrate embryo. In birds, reptiles, and mammals it replaces the mesonephros as the functional excretory organ and develops into the adult kidney.
[META- + Greek nephros, kidney.]
American Heritage Stedman's Medical Dictionary:
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met·a·neph·ros
(mĕt'ə-nĕf'rəs, -rŏs')
n., pl. -roi (-roi').
n., pl. -roi (-roi').
The third and final excretory organ that develops in a vertebrate embryo. In birds, reptiles, and mammals it replaces the mesonephros as the functional excretory organ and develops into the adult kidney.
met'a·neph'ric (-rĭk) adj.Saunders Veterinary Dictionary:
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metanephros
Pl. metanephroi [Gr.] the third and final attempt to produce a permanent embryonic kidney, developing later than and caudal to the mesonephros.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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