Search Result for "yolk sac":
Wordnet 3.0

NOUN (2)

1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional;
[syn: yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus]

2. membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo;


WordNet (r) 3.0 (2006):

yolk sac n 1: membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional [syn: yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus] 2: membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo