gastrulation
noun
gas·tru·la·tion ˌga-strə-ˈlā-shən 
: the process of becoming or of forming a gastrula
gastrulate
ˈga-strə-ˌlāt
intransitive verb 
Example Sentences
Recent Examples on the Web The first is to study the process known as gastrulation—the point two weeks after conception when embryonic cells begin to differentiate into the body’s more than 200 cell types. 
Jeffrey Kluger, Time, 10 June 2021
Jeffrey Kluger, Time, 10 June 2021 Word History
Etymology
borrowed from German Gastrulation, from Gastrula gastrula + -ation -ation
First Known Use
1879, in the meaning defined above
Medical Definition
gastrulation
noun
gas·tru·la·tion ˌgas-trə-ˈlā-shən
: the process of becoming or of forming a gastrula