metanephros

詳細解釋：

met.a.neph.ros

n.（名詞）
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.
後腎：脊椎動物胚胎髮育中的第三個也是最後一個排泄器官。在鳥類、爬行動物和哺乳動物中它代替中腎起排泄器官的作用，並最終發育成腎

來源：
meta-
meta-
Greek nephros [kidney]
希臘語 nephros [腎臟]