ἡρωίνη
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)
[ῑ], ἡ, fem. of ἥρως,
A heroine, Theoc. 13.20, 26.36, Call.Del.161, D.P.1022, Luc.Nec.15, D.C.48.50: contr. ἡρῴνη, Ar.Nu.315, IG14.1389i55, 22.1358.8, al.; ἠροΐνα ib.12(2).228 (Mytil.). II a deceased woman (cf. ἥρως 11), CIG2259 (Samos), IG3.889; of a deified Empress, Jul.Caes.334b.