Submitted by György Chityil ... on Fri, 01/19/2018 - 22:00 Hierarchy: NounDescription: {{embryology}} A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm.Ngram: gastrulaNgram Text: gastrulaSource: WiktionaryIssue: 0Wiktionary tag: embryologyNgram Count: 1