blastula
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: blastosphere • Derivationally related forms: blastospheric (for: blastosphere), blastular • Hypernyms: embryo, conceptus, fertilized egg • Hyponyms: blastocyst, blastodermic vessicle • Part Meronyms: blastocoel, blastocoele, blastocele, segmentation cavity, cleavage cavity, trophoblast
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