yolk sac
短语卵黄囊 [医] 卵黄囊
词形变化
yolk sacs
复数
yolk sacs
别名
yolksac
释义与例句
n.
-
1.
A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals.
医学