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πρόσορθρον

Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

Russian (Dvoretsky)

πρόσορθρον: дор. πότορθρον, v. l. ποτ᾽ ὄρθρον (τό) adv. на рассвете, к утру Theocr.