λιγύμοχθος
From LSJ
πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
German (Pape)
[Seite 43] sich mit hellem Gesange abmühend, ἀηδών, Ar. Av. 1381, v. l. λιγύμυθος.
Russian (Dvoretsky)
λιγύμοχθος: без устали и звонко поющий (Arph. - v. l. λιγύφθογγος).