Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
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.]
met′a·neph′ric (-rĭk) 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.
n, pl -roi (-rɔɪ)
[C19: New Latin, from meta- + Greek nephros kidney]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
met•a•neph•ros(ˌmɛt əˈnɛf rɒs)
n., pl. -roi (-roi).
an embryonic excretory organ of reptiles, birds, and mammals, which develops into the functional kidney.
[1875–80; meta- + Greek nephrós kidney]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.