Title: gastrula Long Title: IUPAC Gold Book - gastrula DOI: 10.1351/goldbook.10749 Status: current Definition Embryonic stage that develops from two to three germ layers during gastrulation. Related Terms - gastrulation: https://goldbook.iupac.org/terms/view/10750 - germ layers: https://goldbook.iupac.org/terms/view/10763 Source - PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 758 (https://doi.org/10.1515/pac-2015-1202) Other Outputs - html: https://goldbook.iupac.org/terms/view/10749/html - json: https://goldbook.iupac.org/terms/view/10749/json - xml: https://goldbook.iupac.org/terms/view/10749/xml Citation: Citation: 'gastrula' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.10749 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. Accessed: 2026-05-10T13:17:39+00:00