Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
νυκτερινόν a nightly LXX.Job.20.8
νυκτερινού by night LXX.Ps.91.5
nightly LXX.Job.4.13
νυκτερινή a nightly LXX.Job.33.15
nightly LXX.Prov.7.9
νυκτερινάσ nightly LXX.Job.35.10

Liddell-Scott-Jones

νυκτερινός (nukterinos) nightly G:A

νυκτερινός-ῐνός, , όν,

(νύξ) by night, nightly, φυλακή [Refs 5th c.BC+]; στρατηγός (={νυκτοστράτηγος}) [Refs 1st c.BC+]; ἀναχώρησις [Refs 5th c.BC+]; ν. γενέσθαι to happen by night, [Refs 5th c.BC+]at dead of night, [Refs 2nd c.AD+]

__2 Astrology texts, potent by night, [Refs 2nd c.AD+]
__3 substantive, νυκτερινόςινός, , a kind of musical composition for the flute, used in Dionysiac worship, [Refs 3rd c.BC+]