yolk
— Noun
– English
~ the yellow spherical part of an egg that is surrounded by the albumen
yolk sac
— Noun
– English
~ membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
yolk
— Noun
– English
~ nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
yolk sac
— Noun
– English
~ membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo