χόανον
From LSJ
τὰ πρὸ Εὐκλείδου ἐξετάζειν → investigate what happened before the flood, investigate what happened in the distant past, investigate what happened before Euclid, investigate what happened before the year of Euclid
German (Pape)
[Seite 1361] τό, zsgzgn χῶνον, = χόανος.