ποταμήιος

From LSJ

εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses

Source

Greek (Liddell-Scott)

ποτᾰμήιος: -η, -ον, Ἰων. καὶ ποιητ. ἀντὶ ποτάμιος, Νόνν. Δ. 11. 309, κτλ.