Allantois

[ә'læntәuis]

解释:

(noun.) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals).

艾维斯编辑--From WordNet

解释:

(n.) Alt. of Allantoid

希勒尔录入

解释:

n. a membranous sac-like appendage for effecting oxygenation in the embryos of mammals birds and reptiles.—adjs. Allantō′ic Allan′toid.

卡洛整理