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: ↑blastula
• Derivationally related forms: ↑blastospheric, ↑blastular (for: ↑blastula)
• Hypernyms: ↑embryo, ↑conceptus, ↑fertilized egg
• Hyponyms: ↑blastocyst, ↑blastodermic vessicle
• Part Meronyms: ↑blastocoel, ↑blastocoele, ↑blastocele, ↑segmentation cavity, ↑cleavage cavity, ↑trophoblast
Useful english dictionary. 2012.