ῥίζωσις
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
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.
German (Pape)
[Seite 843] 1) das Einwurzelnlassen, Befestigen. – 2) intrans., das Wurzeln, Wurzelschlagen, Theophr. Auch τῶν γεννωμένων, vom Menschen, Plut. Lyc. 14.