κυβευτής
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
English (LSJ)
οῦ, ὁ,
A dicer, gambler, S.Fr.947, Eup.11.8 D., X.HG 6.3.16, Men.965, Vett.Val.202.6; οἱ Κυβευταί, name of plays by Antiphanes, etc.