Usage: 2 forms in 4 verses
Form Translated As     In Verse(s)
πάχνην frost LXX.Job.38.29
πάχνη frost LXX.Job.38.24LXX.Ps.78.47LXX.Ps.119.83

Liddell-Scott-Jones

πάχνη (pachnē) frost G:N-F

πάχνη-η, ,

(πήγνυμι) hoar-frost, rime (defined as frozen rain, [Refs 8th c.BC+]; opposed to κρύσταλλος, [πάχνηαι καὶ χάλαζαι 5th-6th c.BC: Plato Philosophus “Symposium” 188b; ἀπέκαυσεν ἡ π. τὰς ἀμπέλους 4th-3rd c.BC: Philippides Comicus 25.4. ">Refs 5th c.BC+]

__2 metaphorically, γήρως εὐρῶτα καὶ πάχνηην the mould and frost of age, descriptive of an old man's grey hair, [Refs], compare 381; π. κουροβόρος clotted blood of the eaten children, [Refs 4th c.BC+]