Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
κύβον cube LXX.Job.38.38
κύβοισ cube LXX.Esth.1.6

Liddell-Scott-Jones

κύβος (kubos) a cube G:N-M

κύβος [,

see entry near the end], , cube, [Refs 5th c.BC+]; especiallycubical die, marked on all six sides, mostly in plural, dice, [Refs 5th c.BC+], i.e. God's work is no mere chance, [Refs 5th c.BC+]: later in singular, οἶδ᾽ ὅτι ῥιπτῶ πάντα κύβον κεφαλῆς.. ὕπερθεν ἐμῆς [Refs 1st c.BC+]; ἀνερρίφθω κ., Latin jacta esto alea, [Refs 4th c.BC+]; ἔσχατον κύβον ἀφιέναι try one's luck for the last time, [Refs]

__2 of the single pips on the dice, βέβληκ᾽ Ἀχιλλεὺς δύο κύβω καὶ τέσσαρα he has thrown two aces and a four, [Refs 5th c.BC+]
__3 in plural, gaming-table, [Refs 5th c.BC+]
__II cubic number, [Refs 5th c.BC+]
__III anything of cubic shape: vertebra, [Refs 3rd c.BC+]
__III.2 block of stone, [Refs 3rd c.BC+]; of wood, [Refs 2nd c.BC+]
__III.3 piece of salt fish, [Refs 2nd c.AD+]
__III.4 kind of cubic cake, [Refs 5th c.BC+]
__III.5 hollow above the hips of cattle, Simaristus [Refs]
__III.6 part of an irrigation-machine, [Refs 3rd c.BC+] only in late Poets, [Refs]; coebus [Refs 4th c.AD+]