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blastula n. 胞胚 胞胚 blastula n 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 [synonym: {blastula}, {blastosphere}] Blastula \Blas"tu*la\, n. [NL., dim. of Gr. blasto`s a sprout.]
(Biol.) That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm. [1913 Webster]
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