Word:

yolk sac

Noun1.yolk sac - membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
2.yolk sac - membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
sac, umbilical vesicle, vesicula umbilicus, vitelline sac
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Yoke-toed
Yokeage
Yokefellow
Yokel
yokel-like
Yokelet
yokelish
Yokemate
Yoko Ono
Yokohama
Yokuts
Yold
Yolden
Yolk
Yolk cord
Yolk gland
-- yolk sac --
Yolk sack
Yoll
Yom
Yom Kippur
Yom Kippur War
Yon
Yoncopin
Yond
Yonder
Yoni
Yonker
Yore
York
York rite
York shilling
York use
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