μυριοστύς
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
English (LSJ)
ύος, ἡ,
A body of ten thousand, X.Cyr.6.3.20.
German (Pape)
[Seite 220] ύος, ἡ, eine Zahl, Menge von zehntausend, Xen. Cyr. 6, 3, 20 u. Sp.