τριτημόριον
From LSJ
τὸ ἐμόν γ' ἐμοὶ λέγεις ὄναρ → you are telling me what I know already, you are telling me my own dream
Russian (Dvoretsky)
τρῐτημόριον: τό третья часть, треть Her., Thuc. etc.
German (Pape)
τό, neutr. zu τριτημόριος, der dritte Teil, das Dritteil; Her. 9.34, Thuc. 2.98, Plat. Phaed. 105b. – Eine Münze, sechs χαλκοῦς wert.