ὀνάριον
From LSJ
Ὁ μὲν βίος βραχύς, ἡ δὲ τέχνη μακρή, ὁ δὲ καιρὸς ὀξύς, ἡ δὲ πεῖρα σφαλερή, ἡ δὲ κρίσις χαλεπή → Life is short, art long, opportunity fleeting, experience misleading and judgment difficult
English (LSJ)
τό, Dim. of ὄνος, Diph.89, Macho ap.Ath.13.582c, Arr.Epict.2.24.18,
A Vit.Aesop. Oxy.2083.19, POxy.63.11 (ii/iii A. D.) ; of a bronze figure, PGiss.47.17 (ii A. D.).