ὑακίνθινος G5191
hyakínthinos · hoo-ak-in'-thee-nos · Adjective
from ὑάκινθος; "hyacinthine" or "jacinthine", i.e. deep blue:--jacinth.
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.