blastodermic_vesicle
1. [ noun ] (zoology,embryology) 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
Synonyms: blastosphere blastula
Related terms: embryo blastocyst blastocoel