ὄσιρις
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)
ιδος, ἡ, A poet's cassia, Osyris alba, Dsc.4.140 (v.l. ὄσυρις), Gal.12.93, Plin.HN27.111.