τρῆσις
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)
εως, ἡ, (τετραίνω)
A boring through, perforation, Pl.Plt.279e: pl., Hp.Steril.222. II orifice, Arist.HA495a28 (pl.).
Greek (Liddell-Scott)
τρῆσις: -εως, ἡ, (√ΤΡΑ, τετραίνω) διάτρησις, τρύπημα, Πλάτ. Πολικ. 279Ε. ΙΙ. τρῆμα, ἄνοιγμα, Ἀριστ. π. τὰ Ζ. Ἱστ. 1. 10, 10.
Russian (Dvoretsky)
τρῆσις: εως ἡ τετραίνω
1) просверливание, прокалывание: τὰ ἄνευ τρήσεως συνδετά Plat. (нечто) скрепленное без швов;
2) дыра, отверстие Arst.
Dutch (Woordenboekgrieks.nl)
τρῆσις -εως, ἡ [τετραίνω] doorboring.