Princeton's WordNet
blastula, blastospherenoun
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
Synonyms:
blastosphere, blastula
Concise Medical Dictionary, by Joseph C Segen, MD
blastosphere
Synonyms:
Blastula, blastula [NE3]
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