gastrula

n., pl., -las, or -lae (-lē').
An embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.

[New Latin : Greek gastēr, gastr-, belly + Latin -ula, feminine diminutive suff..]

gastrular gas'tru·lar (-lər) adj.

(găs'trə-lə)
n., pl. -las or gas·tru·lae (-lē').

An embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.

An embryo in the stage following the blastula stage; the simplest type consists of two layers of cells, the ectoderm and entoderm, which have invaginated to form the archenteron and an opening, the blastopore.

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The noun has one meaning:

Meaning #1: double-walled stage of the embryo succeeding the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm

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