• word of the day

    yolk sac

    yolk sac - Dictionary definition and meaning for word yolk sac

    Definition
    (noun) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional Definition
    (noun) membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
Connect with us on Facebook