διάνηψις
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
English (LSJ)
εως, ἡ, A clearing off, τῶν χυμῶν Aret.CD2.2 (perh. f.l. for διάνιψις).
Greek (Liddell-Scott)
διάνηψις: -εως, ἡ, ἀποκάθαρσις, ἐξάτμισις, τῶν χυμῶν Ἀρετ. Θερ. Χρον. Παθ. 2. 2.