from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Applied to a gastrula when the blastopore does not entirely open up.
from the GNU version of the Collaborative International Dictionary of English
- adj. Applied to a gastrula when the blastopore does not entirely close up.
from The Century Dictionary and Cyclopedia
- Pertaining to or having the characters of the Archæostomata.
- In biology, having a primitive blastopore or original orifice of invagination of a blastosphere which has undergone gastrulation; retaining an archenteric aperture, as distinguished from any other which may be acquired by a deuterostomatous gastrula: it is the usual state of those gastrulæ which are formed by emboly.
Ancient Greek ancient + mouth. (Wiktionary)