Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
A stage in the development of embryos of most animals consisting of a three-layered sac of ectoderm, mesoderm and endoderm.
Definition source: English Wiktionary via Wiktextract
Topics: embryology, medicine, sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: embryo, conceptus, fertilized egg
History
From German Gastrula, coined by Ernst Haeckel in his 1872 work "Biology of Calcareous Sponges". From gastr- (from Ancient Greek γαστήρ (gastḗr, “stomach”) + Latin -ula.
