from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hollow blastula, supposed to be the primitive form.
from the GNU version of the Collaborative International Dictionary of English
- n. A hollow blastula, supposed to be the primitive form; a cœloblastula.
from The Century Dictionary and Cyclopedia
- n. In embryology, a hollow and usually globular vesicle, the walls of which consist of a single layer of similar cells, and which by invagination develops an archigastrula.
archi- + blastula (Wiktionary)