Noun: blastula (blastulas,blastulae) blas-chû-lu
- Early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
"The blastula implanted in the uterine wall, beginning the next stage of pregnancy";
- blastosphere
Derived forms: blastulae, blastulas
Type of: conceptus, embryo, fertilised egg [Brit], fertilized egg
Encyclopedia: Blastula