Ἀλεξανδρειανός

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

Source

Spanish (DGE)

-ή, -όν
alejandrino ét. de Alejandría, St.Byz.s.u. Ἀλεξάνδρειαι.