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καιρόν

Ἀλλ’ ἐσθ’ ὁ θάνατος λοῖσθος ἰατρός κακῶν -> But death is the ultimate healer of ills
Sophocles, Fragment 698

Russian (Dvoretsky)

καιρόν: adv. вовремя, кстати (ἐληλυθώς Soph.).