ἀπφίδιον
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)
[φῑ], τό, Sch.Luc.Cat.12, and ἀπφίον, τό, Eust.565.23, Dim. of ἀπφά; also ἀπφία Poll.3.74, cf. Hsch.
German (Pape)
[Seite 341] τό, = ἀπφίον, τό, dasselbe.
Greek (Liddell-Scott)
ἀπφίδιον: [φῑ], τό, Σχολ. Λουκ., καὶ ἀπφίον ἢ ἄπφιον, τό, Εὐστάθ. ἔνθ’ ἀνωτ., ὑποκορ. τοῦ ἀπφά, πρβλ. Πολυδ. Γ΄, 74.