This root form (lemma) is used in 4 different forms in the NT: θείου (GNS), θείῳ (DNS), θεῖον (ANS), θεῖον (NNS).
It is glossed in 3 different ways: ‘of sulfur’, ‘brimstone’, ‘sulfur’.
OET LUKE 17:29 Greek word=θεῖον (theion) Morphology=ANS English gloss=‘brimstone’ SR GNT LUKE 17:29 word 12
OET REV 9:17 Greek word=θεῖον (theion) Morphology=NNS English gloss=‘sulfur’ SR GNT REV 9:17 word 41
OET REV 9:18 Greek word=θείου (theiou) Morphology=GNS English gloss=‘sulfur’ SR GNT REV 9:18 word 24
OET REV 14:10 Greek word=θείῳ (theiōi) Morphology=DNS English gloss=‘sulfur’ SR GNT REV 14:10 word 32
OET REV 19:20 Greek word=θείῳ (theiōi) Morphology=DNS English gloss=‘sulfur’ SR GNT REV 19:20 word 51
OET REV 20:10 Greek word=θείου (theiou) Morphology=GNS English gloss=‘of sulfur’ SR GNT REV 20:10 word 15
OET REV 21:8 Greek word=θείῳ (theiōi) Morphology=DNS English gloss=‘sulfur’ SR GNT REV 21:8 word 36