blastula

blas·tu·la

noun \ˈblas-chə-lə\

plural -las or blas·tu·lae \-ˌlē\

Definition of BLASTULA

: an early metazoan embryo typically having the form of a hollow fluid-filled rounded cavity bounded by a single layer of cells—compare gastrula, morula

—blas·tu·lar \-lər\ adjective

—blas·tu·la·tion \ˌblas-chə-ˈlā-shən\ noun

Illustration of BLASTULA