1 文書を見つけるための辞書。

• blastula, blastosphere
• 胞胚
• 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
• 卵子の分裂により作られる胎児の初期段階