blastula
演变路径（由近及远）
词源说明
From New Latin blastula, diminutive of Ancient Greek βλαστός (blastós, “a germ, bud, sprout, shoot”), from βλαστάνω (blastánō, “to bud, sprout, grow, properly of plants, but also of animals”).
释义（英文）
名词 Noun
- (embryology) An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.