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Từ điển WordNet v3.1 - WordNet Dictionary
blastula


noun
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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