ῥυθμιστής
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)
German (Pape)
[Seite 850] ὁ, der Ordner (?).
Greek (Liddell-Scott)
ῥυθμιστής: -οῦ, ὁ, ὁ ῥυθμίζων, διευθετῶν, Θεοδώρητ. ἐν Φωτ. Βιβλ. 508. 21.