尿にょう膜まく

noun

allantois

Embryological term for the fetal membrane involved in gas exchange and waste storage in reptiles, birds, and mammals.

• 尿にょう膜まくは爬は虫ちゅう類るいや鳥ちょう類るいの胚はいで発はっ達たつする。

  The allantois develops in the embryos of reptiles and birds.