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  1. Oxford American Dictionary

    mesoderm

    • IPA[ˈmezəˌdərm]

    美式

    • n.
      the middle layer of an embryo in early development, between the endoderm and ectoderm.

    • noun: mesoderm

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    mesoderm

    • IPA[ˈmɛsə(ʊ)dəːm]

    英式

    • n.
      the middle layer of cells or tissues of an embryo, or the parts derived from this (e.g. ...

    Oxford Dictionary