Becomes the intestinal or digestive cavity

• Central cavity of the gastrula

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 .

Wikipedia Word definitions in Wikipedia
The primary gut that forms during gastrulation in the developing zygote is known as the archenteron or the digestive tube . It develops into the endoderm and mesoderm of an animal.

WordNet Word definitions in WordNet
n. central cavity of the gastrula; becomes the intestinal or digestive cavity

Wiktionary Word definitions in Wiktionary
n. (context anatomy English) A primitive alimentary cavity