κλαΐς
From LSJ
τὸ γὰρ ἐμφυὲς οὔτ' αἴθων ἀλώπηξ οὔτ' ἐρίβρομοι λέοντες διαλλάξαιντο ἦθος → the red fox and the roaring lion cannot change the nature born in them
German (Pape)
[Seite 1445] ῗδος, ἡ, dor. = κλείς, Pind.
Greek (Liddell-Scott)
κλᾱΐς: γεν, κλᾱῖδος, ἡ, Δωρ. ἀντὶ κληΐς, κλείς, λατ. clavis.