Protostomia Definition
pronoun
A taxonomic superphylum within the subkingdom Eumetazoa — the bilateral animals with three germ cells.
Wiktionary
Origin of Protostomia
from Ancient Greek πρωτο- (prōto-, “first”) + στόμα (stoma, “mouth”) + -ia, referring to a theory about the order of embryonic development.
From Wiktionary
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