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  1. Oxford American Dictionary

    yolk sac

    • IPA[yōk sak]
    • n.
      a membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae of some fishes.；a sac lacking yolk in the early embryo of a mammal.

    • noun: yolk sac, plural noun: yolk sacs

    • 更多解釋

    yolk sac

    • n.
      a membranous sac containing yolk attached to the embryos of reptiles and birds and the larvae ...

    Oxford Dictionary