noun, plural met·a·neph·roi [met-uh-nef-roi] /ˌmɛt əˈnɛf rɔɪ/. Embryology.

one of the three embryonic excretory organs of higher vertebrates, becoming the permanent and functional kidney.

Nearby words

  1. metanalysis,
  2. metanarrative,
  3. metanephric duct,
  4. metanephrine,
  5. metanephrogenic,
  6. metanira,
  7. metanitrophenol,
  8. metanoia,
  9. metapelet,
  10. metaph.

Origin of metanephros

1875–80; < New Latin < Greek meta- meta- + nephrós kidney

Related formsmet·a·neph·ric, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for metanephros

British Dictionary definitions for metanephros


noun plural -roi (-rɔɪ)

the last-formed posterior part of the embryonic kidney in reptiles, birds, and mammals, which remains functional in the adultSee also pronephros, mesonephros

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

Medicine definitions for metanephros


[mĕt′ə-nĕfrəs, -rŏs′]

n. pl. met•a•neph•roi (-roi′)

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.
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.