σύναγμα
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
ατος, τό, (συνάγω)
A collection, concretion, such as stone or gravel in the kidneys, Hp.Epid.6.3.7. 2 v.l. for σύνθεμα in LXX Ec.12.11 cod.A.
German (Pape)
[Seite 995] τό, das Zusammengeführte, -gebrachte, Verbundene. Auch der Niederschlag, Bodensatz, bes. bei den Medic. der Nierenstein, das Nierengries.