Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
χουν dust LXX.Isa.41.15
χνούσ dust LXX.Ps.1.4LXX.Isa.5.24
χνουσ dust LXX.Isa.29.5LXX.Hos.13.3
χνουν dust LXX.Isa.17.13

Liddell-Scott-Jones

χνόος (chnoos) dust G:N-N

χνόος,

( [Refs 5th c.BC+], Attic dialect contraction χνοῦς, genitive χνοῦ: irregular genitive χνοός [Refs 4th c.BC+] —ἁλὸς χ. incrustation from salt water, ἔκ κεφαλῆς ἔσμηχεν ἁλὸς χνόον, [Refs 8th c.BC+]; wool pulled for stuffing cushions, flock, falsa lectio for{μνοῦς} in [Refs 5th c.BC+]; used in applying a powder, [Refs 2nd c.AD+]; chaff, [LXX]: powder, proverbial, [ὄνος] εἰς ἄχυρα καὶ χνοῦν [Refs 5th c.BC+]; dust of the earth, [LXX]; ὡς δοκεῖν τοῦ καλουμένου χνοῦ μεστοὺς εἶναι (i.e. τοὺς ὀφθαλμούς) [Refs 2nd c.AD+]

__II fine down on a flower or in the seed-vessel, [Refs 4th c.BC+]:bloom on fruit, ἐν Καρίᾳ φασὶν ἄπιόν τιν᾽ ἔχειν χνοῦν ἁλμώδη [Refs 4th c.BC+]; the first down on the chin or cheeks, χνοῦς ὥσπερ μήλοισιν ἐπήνθει [χνόος ἦλθε παρειαῖς 3rd c.BC: Callimachus Epicus “Hymnus in Apollinem” 37; ἐντίκτει τι χνοῦ ἀνάπλεων 4th c.BC: Aristoteles Philosophus “Historia Animalium” 605b15: \_plural\_, 1st c.BC: Dionysius Halicarnassensis “de Demosthene” 51. ">Refs 5th c.BC+]
__II.2 metaphorically, bloom or film of archaism in writing, τε πίνος αὐτῇ (i.e. in Plato's style) [καὶ χ.] τῆς ἀρχαιότητος.. ἐπιτρέχει interpolated in [Refs 1st c.BC+]; ἐπανθεῖ τις.. χνοῦς ἀρχαιοπινής[Refs 1st c.AD+]; οἱονεὶ τῆς γονίμου φύσεως χ., of χλόη, [Refs 3rd c.AD+]

LSJ Scripture Refs: LXX.Ps.1.4 ☩ LXX.2Kgs.22.43 ☩ LXX.2Chr.1.9