en·to·derm /ˈɛntəˌdɚ/
  內胚層; 下胚層
  en·to·derm /ˈɛntəˌdɝm/ 名詞
  內胚層
  En·to·derm n.  Biol. See Endoderm, and Illust. of Blastoderm.
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  entoderm
       n : the inner germ layer that develops into the lining of the
           digestive and respiratory systems [syn: endoderm, endoblast,
            entoblast, hypoblast]