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.
GNU Webster's 1913
- adj. (Biol.) Applied to a gastrula when the blastopore does not entirely close up.
- Ancient Greek ancient + mouth. (Wiktionary)
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