φηγός
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
Dor. φᾱγός Theoc.9.20, ἡ,
A = δρῦς ἀγρία, Valonia oak, Quercus Aegilops, Thphr.HP3.3.1, 3.8.2, etc.: freq. in Il.(not in Od.), Διὸς περικαλλέϊ φηγῷ Il.5.693; φηγῷ ἐφ' ὑψηλῆ . . Διός 7.60; ἡ παλαιὰ φ., of the oak of Dodona, S.Tr.171, cf. Hes.Frr.134.7, 212 (but δρῦς S.Tr.1168). II acorn of the same tree, Ar.Pax1137 (lyr.), Pl.R. 372c, Theoc. l.c., D.Chr.6.62. (Cf. Lat. fāgus 'beech', OE. bóc 'beech'.)