διαιτητής
From LSJ
ὅταν δὲ τἄμ' ἀθυμήσαντ' ἴδῃς, σύ μου τὸ δεινὸν καὶ διαφθαρὲν φρενῶν ἴσχναινε παραμυθοῦ θ' → whenever you see me despondent over my situation, do what you can to lessen and relieve what is wild and senseless in my thinking | whenever you see me despondent, you must cure the grim derangement of my mind and encourage me
English (LSJ)
οῦ, ὁ,
A arbitrator, umpire, Hdt.5.95, Pl.Lg.956c, etc.; τῆς γὰρ δίκης . . γίγνεταί μοι δ. Στράτων D.21.83; δ. ὁ μέσος Arist.Pol.1297a6; esp. at Athens, Id.Ath.53, etc. II in later Law, = judex pedaneus, Cod.Just.4.20.15, etc.
