noun \ˈgas-trə-lə\
plural gas·tru·las or gas·tru·lae\-ˌlē, -ˌlī\

Definition of GASTRULA

:  an early metazoan embryo in which the ectoderm, mesoderm, and endoderm are established either by invagination of the blastula (as in fish and amphibians) to form a multilayered cellular cup with a blastopore opening into the archenteron or by differentiation of the blastodisc (as in reptiles, birds, and mammals) and inward cellular migration — compare blastula, morula
gas·tru·lar \-lər\ adjective

Origin of GASTRULA

New Latin, from gastr-
First Known Use: 1876


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