ὀνόμυλος
From LSJ
κρείσσων ἐναρχόμενος βοηθῶν καρδίᾳ τοῦ ἐπαγγελλομένου καὶ εἰς ἐλπίδα ἄγοντος· δένδρον γὰρ ζωῆς ἐπιθυμία ἀγαθή (Proverbs 13.12 LXX) → One who sincerely sets about helping is better than one who makes promises leading to hope; for a kindly urge is a tree of life.
Greek (Liddell-Scott)
ὀνόμυλος: ὁ, μύλος στρεφόμενος ὑπὸ ὄνου, Μιχ. Ἀτταλ. ἐν Σάθ. Μεσ. βιβλ. τ. Α΄, σ. 10.