[医] 原肠

[ noun ]
central cavity of the gastrula; becomes the intestinal or digestive cavity
<noun.animal>

Archenteron \Arch`en"ter*on\, n. [Pref. arch- + Gr. ?
intestine.] (Biol.)
The primitive enteron or undifferentiated digestive sac of a
gastrula or other embryo. See Illust. under {Invagination}.