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 (prō-nĕf′rəs, -rŏs′)
n. pl. pro·neph·roi (-roi) or pro·neph·ra (-rə)
A kidneylike organ, being either part of the most anterior pair of three pairs of organs in a vertebrate embryo, disappearing early in the embryonic development of most vertebrates.

[pro- + Greek nephros, kidney.]

pro·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) or -ra (-rə)
(Zoology) the first-formed anterior part of the embryonic kidney in vertebrates, which remains functional in the larvae of the lower vertebrates. See also mesonephros, metanephros
[C19: New Latin, from pro-2 + Greek nephros kidney]
proˈnephric adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(proʊˈnɛf rɒs, -rəs)

n., pl. -roi (-roi), -ra (-rə)
an excretory organ of vertebrate embryos, which in some primitive fishes develops into a functional kidney.
[1875–80; < New Latin < Greek pro- pro-2 + nephrós kidney]
pro•neph′ric, adj.
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