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  1. Oxford American Dictionary

    trophoblast

    • IPA[ˈtrōfəˌblast]

    美式

    • n.
      a layer of tissue on the outside of a mammalian blastula, supplying the embryo with nourishment and later forming the major part of the placenta.

    • noun: trophoblast, plural noun: trophoblasts

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    trophoblast

    • IPA[ˈtrɒfəblɑːst]

    英式

    • n.
      a layer of tissue on the outside of a mammalian blastula, supplying the embryo with nourishment ...

    Oxford Dictionary