Definition of yolk sac
English to English noun - membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
source: WordNet 3.0 - membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
source: WordNet 3.0
Visual Synonyms 
Nearby Word
yolk sac, yolk, yellow sea, yellow jack, yelk, yellow squash, yellow oak, yliche, yellows, yule log, yellowish, yellowlegs, yellowcake
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