| NOUN | animal | blastula, blastosphere | early stage / stage of an embryo produced by cleavage of an ovum |
|---|
| Meaning | Early stage / stage of an embryo produced by cleavage of an ovum; a liquid / liquid-filled sphere whose wall / 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. | |
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| Synonym | blastosphere | |
| Parts | blastocoel, blastocoele, blastocele, segmentation cavity, cleavage cavity | The fluid-filled cavity inside a blastula |
| trophoblast | The membrane that forms the wall of the blastocyst in early development | |
| Narrower | blastocyst, blastodermic vessicle | The blastula of a placental mammal in which some differentiation of cells has occurred |
| Broader | embryo, conceptus, fertilized egg | An animal organism in the early stages / stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life |
| Spanish | blastósfera, blastosphere, blástula | |
| Catalan | blastosphere, blàstula | |
| Adjectives | blastular | of or relating to a blastula |
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