• synonyms


noun, plural met·a·neph·roi [met-uh-nef-roi] /ˌmɛt əˈnɛf rɔɪ/. Embryology.
  1. one of the three embryonic excretory organs of higher vertebrates, becoming the permanent and functional kidney.
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Origin of metanephros

1875–80; < New Latin < Greek meta- meta- + nephrós kidney
Related formsmet·a·neph·ric, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for metanephros

Historical Examples of metanephros

  • The differentiation of a posterior section of the mesonephros into a special gland foreshadowing the metanephros of the Amniota.

    The Works of Francis Maitland Balfour, Volume III (of 4)

    Francis Maitland Balfour

  • The ureter which carries off the secretion of the kidney proper or metanephros.

  • The mode of development of the metanephros has as yet only been satisfactorily elucidated in the Chick (Sedgwick, No. 549).

British Dictionary definitions for metanephros


noun plural -roi (-rɔɪ)
  1. the last-formed posterior part of the embryonic kidney in reptiles, birds, and mammals, which remains functional in the adultSee also pronephros, mesonephros
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Word Origin for metanephros

C19: New Latin, from meta- + 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

metanephros in Medicine


(mĕt′ə-nĕfrəs, -rŏs′)
n. pl. met•a•neph•roi (-roi′)
  1. 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.
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Related formsmet′a•nephric (-rĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.