blastula的復數形
blastulae See {blastula} blastula n : 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 [syn: {blastodermic vesicle}] [also: {blastulae} (pl)]