Ar′chæ‐o‐stom″a‐tous (�), a. [Gr. αρχαἰ̑οσ ancient + στόμα mouth.] (Biol.) Applied to a gastrula when the blastopore does not entirely close up.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.