πορφυρίων
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)
ωνος, ὁ,
A purple coot or water-hen, Fulica porphyrion, Ar.Av.707, al., Arist.HA509a11, 595a12, LXX Le.11.18, Polem.Hist.59; distd. from the πορφυρίς, Call.Fr. 100c.2. II a kind of polypus, Artem.2.14. 2 a kind of fish, Hsch.