In embryology, the primary or rudimentary stomach or digestive cavity formed during early development.
From Greek archi- (first, chief) + gaster (stomach). This scientific term combines the prefix for 'primitive' with the anatomical term for stomach, used since the 19th century in developmental biology.
Embryologists use 'archi-' terms to describe the first versions of body parts—it's like calling the basic sketch of something the 'archi-' version before it develops into its final form.
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