mesonephros

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mes·o·neph·ros

 (mĕz′ə-nĕf′rəs, -rŏs′, mĕs′-)
n.
The second of the three excretory organs that develop in a vertebrate embryo, becoming the functioning kidney in fish and amphibians but replaced by the metanephros in birds, reptiles, and mammals. Also called Wolffian body.

[meso- + Greek nephros, kidney.]

mes′o·neph′ric adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

mesonephros

(ˌmɛsəʊˈnɛfrɒs)
n
(Zoology) the middle part of the embryonic kidney in vertebrates, becoming the adult kidney in fishes and amphibians and the epididymis in reptiles, birds, and mammals. See also pronephros, metanephros
[C19: New Latin, from meso- + Greek nephros kidney]
ˌmesoˈnephric adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

mes•o•neph•ros

(ˌmɛz əˈnɛf rɒs, ˌmɛs-, ˌmi zə-, -sə-)

n., pl. -roi (-roi).
an excretory organ of vertebrate embryos, developing into the functional kidney in fishes and amphibians and into part of the ducts and tubules of the reproductive system in reptiles, birds, and mammals.
[1875–80; meso- + Greek nephrós kidney]
mes`o•neph′ric, adj.
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