arch·en·ter·on /ɑrˈkɛntəˌrɑn, rən/
  原腸
  arch·en·ter·on /ɑrˈkɛntəˌrɑn, rən/ 名詞
  原腸腔(動)
  Arch·en·ter·on, n.  Biol. The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.
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  archenteron
       n : central cavity of the gastrula; becomes the intestinal or
           digestive cavity