συμφοιτητής
From LSJ
ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving
English (LSJ)
οῦ, ὁ,
A schoolfellow, Pl.Euthd.272c, Phdr. 255a, X.HG2.4.20, Arist.EN1162a33, Gal.16.684. II fellowpilgrim to the temple of Asclepius, Aristid.Or.50(26).42 (pl.), 48(24).27, 28(49).133. (Cf. φοιτητής.)