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[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).
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 of mesonephros
1875-80; < New Latin, equivalent to meso- meso- + Greek nephrós kidney
Related forms
mesonephric, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for mesonephros


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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