G5191–ὑακίνθινος–huakinthinos

And so I saw the horses in the vision, and those who were seated on them, having breastplates of fire and glass and of burning stone: and the heads of the horses were as the heads of lions; and out of their mouths came fire and smoke and a smell of burni

ὑακινθίνους hu'akinthinous “hyacinthine”