ῥίζωσις
From LSJ
Εὐφήμει, ὦ ἄνθρωπε· ἁσμενέστατα μέντοι αὐτὸ ἀπέφυγον, ὥσπερ λυττῶντά τινα καὶ ἄγριον δεσπότην ἀποδράς → Hush, man, most gladly have I escaped this thing you talk of, as if I had run away from a raging and savage beast of a master
English (LSJ)
εως, ἡ,
A taking root, Thphr.CP2.12.5, 8.1.3; ῥ. λαμβάνειν Plu.Publ.8: metaph., of the formation of the embryo, ὀμφαλὸς -ώσιος ἀρχά Philol.13; ἡ τῶν γεννωμένων ῥ. Plu.Lyc.14; origin of veins and arteries, Hp.Alim.31.