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  1. ectoderm

    • IPA[ˈɛktə(ʊ)dəːm]

    英式

    • n.
      the outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis, nerve tissue, and nephridia.
    • noun: ectoderm, plural noun: ectoderms