Strong’s Greek
G4447 — purinos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πύρινος
purinos — pronounced poo'-ree-nos
from 4443; fiery, i.e. (by implication) flaming:--of fire. see GREEK for 4443
1 occurrence in the KJV.
Revelation 9:17
And 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.