Synonyms for Blastodermic Vesicle (same or very similar meaning)
WordNet sense 1 (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):
blastulaFrom the ODE community, based on WordNetadd/edit