Quick Definition
θεῖον, ου, τό n.n. brimstone, sulfur
Strong's Definition
probably neuter of 2304 (in its original sense of flashing); sulphur
KJV Usage: brimstone
UBS Dictionary of the Greek New Testament
noun, n. | -ου | θειώδης
2.26 · Natural Substances · Earth, Mud, Sand, Rock
sulfur, brimstone a chemical found in pale yellow mineral form; burns readily in air and is found in regions of vulcanic activity such as the Dead Sea area; causes land to be infertile; associated with punishment from God In the NT θεῖον is always associated in some way with fire and refers to the kinds of burning hot rocks involved in volcanic eruptions. The closest equivalent in a number of languages is ‘burning stones’ or ‘fiery hot stones’ or ‘fiery red stones.’
LUK 2:4 · LUK 17:29 · REV 9:17 · REV 9:18 · REV 14:10 · REV 19:20 · REV 20:10 · REV 21:8
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
θεῖον, -ov, τό, (apparently the neut. of the adj. θεῖος i. qdivine incense, because burning brimstone was regarded as having power to purify, and to ward off contagion [but Curtius § 320 allies it w. θύω : ef. Lat. fumus, Eng. dust]), brimstone : Lk. xvii. 29; Rev. ix. 17 sq.; xiv. 10; xix. 20; [xx.10]; xxi. 8. (Gen. xix. 24; Ps. x. (xi.) 6; Ezek. xxxviii. 22; Hom. Il. 16, 228; Od. 22, 481, 493; (Plat.) Tim. Locr. p. 99 ¢.; Ael. v. h. 13, 15[16]; Hdian. 8, 4, 26 [9 ed. Bekk.].)
Mounce Concise Greek Dictionary
θεῖον theion 7x
brimstone, sulphur, Lk. 17:29; Rev. 9:17; 14:10; 19:20; 20:10; 21:8*
Abbott-Smith Greek Lexicon
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.†
Liddell-Scott-Jones — Greek-English Lexicon
θεῖον (theion) — sulfur. 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.)