Home›Browse›G›gastrulationgastrulationOur editors are putting together more complete content — check back in about 20 minutesgastrulationgastrulation — nounnoun1. the process in embryo development where cells rearrange to form three layers1.nounDefinitionthe process in embryo development where cells rearrange to form three layersExampleGastrulation is a critical stage in the development of most animals.