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pronephroi

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pro⋅neph⋅ros

  [proh-nef-ros, -ruhs]
Use pronephroi in a Sentence
–noun, plural -roi  [-roi] , -ra  [-ruh] . Embryology.
one of the three embryonic excretory organs of vertebrates, which becomes the functional kidney of certain primitive fishes.

Origin:
1875–80; < NL < Gk pro- pro- 2 + nephrós kidney

Related forms:
pro⋅neph⋅ric  [proh-nef-rik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pro·neph·ros   (prō-něf'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 higher vertebrates, but functioning as a kidney in some simple vertebrates, such as the lamprey.

[pro-2 + Greek nephros, kidney.]
pro·neph'ric (-rĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: pro·neph·ros
Pronunciation: (')prO-'nef-r&s, -"räs
Function: noun
Inflected Form: plural pro·neph·roi /-"roi/
: either member of the first and most anterior pair of the three paired vertebrate renal organs that functions in the adults of amphioxus and some lampreys, functionstemporarily in larval fishes and amphibians, and is present but nonfunctional in embryos of reptiles, birds, and mammals —compare MESONEPHROS, METANEPHROS
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

pronephros pro·neph·ros (prō-něf'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, usually disappearing early in embryonic development.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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