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

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

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

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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