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κοὐκ

Σκιᾶς ὄναρ ἄνθρωπος -> Man is a dream of a shadow
Pindar, Pythian 8.95f.

French (Bailly abrégé)

crase poét. p. καὶ οὐκ.

Dutch (Woordenboekgrieks.nl)

κοὐ(κ) crasis voor καὶ οὐ(κ).

Russian (Dvoretsky)

κοὐκ: in crasi = καὶ οὐκ.