ἰταμόν

From LSJ

νὺξ μὲν ἐμὸν κατέχει ζωῆς φάος ὑπνοδοτείρη → sleep-giving night hath quenched my light of life | sleep-giving night covers my light of life | night, the giver of sleep, holds the light of my life

Source

Russian (Dvoretsky)

ἰτᾰμόν: (ῐ) τό дерзновенность, решительность (τῆς ψυχῆς Plut.).