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mesonephros

[mez-uh-nef-ros, mes-, mee-zuh-, -suh-] /ˌmɛz əˈnɛf rɒs, ˌmɛs-, ˌmi zə-, -sə-/
noun, plural mesonephroi
[mez-uh-nef-roi, mes-, mee-zuh-, -suh-] /ˌmɛz əˈnɛf rɔɪ, ˌmɛs-, ˌmi zə-, -sə-/ (Show IPA).
Embryology
1.
one of the three embryonic excretory organs of vertebrates, becoming the functional kidney of fishes and amphibians and becoming part of the tubules or ductules in the reproductive systems of higher vertebrates.
Origin
1875-1880
1875-80; < Neo-Latin, equivalent to meso- meso- + Greek nephrós kidney
Related forms
mesonephric, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for mesonephros
  • The organ is located just in front of the kidney, or, mesonephros.
British Dictionary definitions for mesonephros

mesonephros

/ˌmɛsəʊˈnɛfrɒs/
noun
1.
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
Derived Forms
mesonephric, adjective
Word Origin
C19: New Latin, from meso- + Greek nephros kidney
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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mesonephros in Medicine

mesonephros mes·o·neph·ros (měz'ə-něf'rəs, -rŏs', měs'-)
n. pl. mes·o·neph·roi (-něf'roi')
The second of the three excretory organs that develop in a vertebrate embryo, replaced by the metanephros in higher vertebrates. Also called wolffian body.


mes'o·neph'ric adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for mesonephros

permanent kidney of amphibians and most fish, developing posterior to and replacing the pronephros of the embryonic and larval stages. It is a paired organ consisting of a set of nephrons having capsules that filter blood from the glomerulus and tubules whose cells reabsorb water and nutrients and secrete nitrogenous wastes. Glomeruli are absent in some marine fish; urine then forms solely in the tubules, a process that conserves water. The tubules empty into a long tube, the Wolffian duct, a remnant of the pronephros. In more advanced vertebrates the mesonephros develops in the embryo but is replaced after the 10th week in humans by the metanephros.

Learn more about mesonephros with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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