Quick Definition
brimstone, sulfur
Strong's Definition
sulphur
Derivation: probably neuter of G2304 (θεῖος) (in its original sense of flashing);
KJV Usage: brimstone
Thayer's Greek Lexicon
θεῖον, θείου, τό (apparently the neuter of the adjective θεῖος equivalent to divine incense, because burning brimstone was regarded as having power to purify, and to ward off contagion (but Curtius, § 320 allies it with θύω; cf. Latinfumus, English dust)), brimstone: Luk_17:29; Rev_9:17; Rev_14:10; Rev_19:20; (); . (Gen_19:24; Psa_10:6 (); Eze_38:22; Homer, Iliad 16, 228; Odyssey 22, 481, 493; (Plato) Tim. Locr., p. 99 c.; Aelian v. h. 13, 15 (16); Herodian, 8, 4, 26 (9 edition, Bekker).)
Mounce Concise Greek Dictionary
θεῖον theion 7x
brimstone, sulphur, Luk_17:29 ; Rev_9:17 ; Rev_14:10 ; Rev_19:20 ; Rev_20:10 ; Rev_21:8
Abbott-Smith Greek Lexicon
θεῖον , -ου , τό ,
[in LXX ; Gen_19:24 , Deu_29:23 Job_18:15 , Psa_11:7 , Isa_30:33 ; Isa_34:9 , Eze_38:22 ( H1614 ), 3Ma_2:5 * ;]
brimstone: Luk_17:29 ( LXX ), Rev_9:17-18 ; Rev_14:10 ; Rev_19:20 ; Rev_20:10 ; Rev_21:8 .†
STEPBible — Tyndale Abridged Greek Lexicon
θεῖον, -ου, τό
[in LXX; Gen.19:24, Deu.29:23 Job.18:15, Psa.11:7, Isa.30:33 34:9, Eze.38:22 (גׇּפְרִית), 3Ma.2:5 * ;]
brimstone: Luk.17:29 (LXX), Rev.9:17-18 14:10 19:20 20:10 21:8.†
(AS)