| blastula | <embryology> Stage of embryonic development of animals near the end of cleavage but before gastrulation. In animals where cleavage (cell division) involves the whole egg, the blastula usually consists of a hollow ball of cells. (18 Nov 1997) |
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| blastular | Pertaining to the blastula. (05 Mar 2000) |
| blastulation | Formation of the blastula or blastocyst from the morula. (05 Mar 2000) |