blastula

Từ điển WordNet v3.1 - WordNet Dictionary

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