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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.

[meta- + Greek nephros, kidney.]

met′a·neph′ric (-rĭk) adj.


n, pl -roi (-rɔɪ)
(Zoology) the last-formed posterior part of the embryonic kidney in reptiles, birds, and mammals, which remains functional in the adult. See also pronephros, mesonephros
[C19: New Latin, from meta- + Greek nephros kidney]


(ˌmɛt əˈnɛf rɒs)

n., pl. -roi (-roi).
an embryonic excretory organ of reptiles, birds, and mammals, which develops into the functional kidney.
[1875–80; meta- + Greek nephrós kidney]
met`a•neph′ric, adj.
References in periodicals archive ?
[sup][14] injected ESCs into day 12–13 embryonic metanephroi and then placed them into a Trans well organ culture.
Fetuses were aseptically removed, and metanephroi from fetuses at embryonic day 14 (E14) were collected and freed of exogenous tissue.
These will develop into the metanephric kidneys (metanephroi) that become the permanent kidneys later in development.