θειώδης G2306
theiṓdēs · thi-o'-dace · Adjective
from θεῖον and 1491; sulphur-like, i.e. sulphurous:--brimstone.
1 Occurrence in the King James Bible
Revelation 9:17And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.