noun, plural metanephroi [met-uh-nef-roi] . Embryology.
one of the three embryonic excretory organs of higher vertebrates, becoming the permanent and functional kidney.

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

metanephric, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
metanephros (ˌmɛtəˈnɛfrɒs)
n , pl -roi
pronephros See also mesonephros the last-formed posterior part of the embryonic kidney in reptiles, birds, and mammals, which remains functional in the adult
[C19: New Latin, from meta- + Greek nephros kidney]

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American Heritage
Medical Dictionary

metanephros met·a·neph·ros (mět'ə-něf'rəs, -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.

met'a·neph'ric (-rĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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Encyclopedia Britannica


permanent kidney in reptiles, birds, and mammals, developing by the 10th week in human embryos from the lower part of the Wolffian duct, and replacing the embryonic structure called the mesonephros. It consists of a compact, paired organ containing many nephrons; a ureter separate from the Wolffian duct leads from the metanephros to the bladder.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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