gastrulation (GO:0007369)

A complex and coordinated series of cellular movements that occurs at the end of cleavage during embryonic development of most animals. The details of gastrulation vary from species to species, but usually result in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm.

Specific

gastrulation with mouth forming first (GO:0001703) gastrulation with mouth forming second (GO:0001702)

General

embryonic morphogenesis (GO:0048598) anatomical structure morphogenesis (GO:0009653)

References

gene ontology: GO:0007369