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1. Oxford American Dictionary

   ectoderm

   • IPA[ˈektəˌdərm]

   美式

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

   • noun: ectoderm, plural noun: ectoderms

2. • 更多解釋

   ectoderm

   • IPA[ˈɛktədəːm]

   英式

   • n.
     the outermost layer of cells or tissue of an embryo in early development, or the parts derived ...

   Oxford Dictionary