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Related to archinephron: archinephros
the primordial kidney; an excretory structure or its rudiments developing in the embryo before the mesonephros; its duct is later used by the mesonephros, which arises caudal to it.
archinephron/ar·chi·neph·ron/ (-nef´ron) a unit of the pronephros.
archinephronAn obsolete term for a unit of the pronephros.