Noun: blastosphere 'blas-tu,sfeer
- 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 blastosphere implanted in the uterine wall, beginning the next stage of pregnancy";
- blastula
Derived forms: blastospheres
Type of: conceptus, embryo, fertilised egg [Brit], fertilized egg
Encyclopedia: Blastosphere