Lexical Definition

‎θεῖον‎ theîon (thi'-on) sulfur G:N-N
probably neuter of ‎θεῖος‎ (in its original sense of flashing)

brimstone.

Usage: 5 forms in 14 verses
Form Translated As     In Verse(s)
θεῖον brimstone Luke.17.29 • Rev.9.17
θείῳ brimstone Rev.14.10 • Rev.19.20
with brimstone Rev.21.8
θείω sulphur LXX.Job.18.15
θείου brimstone Rev.9.18
of sulfur Rev.20.10
sulphur LXX.Isa.30.33
θείον sulphur LXX.Gen.19.24 • LXX.Deut.29.23 • LXX.Ps.11.6 • LXX.Isa.34.9 • LXX.Ezek.38.22

Abbott-Smith

θεῖον, -ου, τό, [in LXX; Ge 19:24, De 29:23 (22), Jb 18:15, Ps 10(11):7*, Is 30:33 34:9, Ez 38:22 (גׇּפְרִית), III Mac 2:5*;]
brimstone: Lk 17:29(LXX), Re 9:17, 18 14:10 19:20 20:10 21:8.†

Abbott-Smith References

Book Refs
Genesis 19:24
Deuteronomy 29:22 · 29:23
Job 18:15
Psalms 11:7*
Isaiah 30:33 · 34:9
Ezekiel 38:22
Luke 17:29
Revelation 9:17 · 9:18 · 14:10 · 19:20 · 20:10 · 21:8

Liddell-Scott-Jones

θεῖον,

__AEpic dialect θέειον (in [Refs 8th c.BC+] θήϊον), τό, brimstone, used to fumigate and purify, δέπας.. ἐκάθηρε θεείῳ [Refs 8th c.BC+]; δεινὴ δὲ θεείου γίγνεται ὀδμή, from a thunderbolt, [Refs 8th c.BC+]; ἐν δὲ θεείου πλῆτο, of a ship struck by lightning, [Refs 8th c.BC+]; ἐμβαλόντες πῦρ ξὺν θ. [LXX+5th c.BC+]; as a natural product, [Refs 5th c.BC+]; opposed to πεπυρωμένον, [Refs 1st c.AD+]; compare θεάφιον, θέαφος. (Perh. cognate with θύω, θυμιάω, Latin suffire.)

LSJ Scripture Refs: LXX.Gen.19.24