δρυός

From LSJ

οὐκ ἔστιν αἰσχρὸν ἀγνοοῦντα μανθάνειν → there is no shame in, not knowing, inquiring

Source

French (Bailly abrégé)

gén. de δρῦς.

Russian (Dvoretsky)

δρυός: gen. к δρῦς.