Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ταρτάρω infernal region LXX.Job.40.20
τάρταρον infernal region LXX.Job.41.32

Liddell-Scott-Jones

Τάρταρος (Tartaros) infernal region TEGMC

Τάρταρος-ος, ,

also [Refs 8th c.BC+]; later, the nether world generally, [Refs 8th c.BC+]; ἀπέραντος, κελαινός, [Refs 4th c.BC+]; Ταρτάρου μελαμβαθὴς κευθμών[LXX]

__II personified as husband of Gaia and father of Typhoeus, [Refs 8th c.BC+]; Γᾶς παῖ καὶ Ταρτάρου, of Cerberus, [Refs 5th c.BC+]

LSJ Scripture Refs: LXX.Job.40.15