4. Unrestrained; fierce; mettlesome; spirited. One curbed the fiery steed. (Dryden)
5. Heated by fire, or as if by fire; burning hot; parched; feverish. The sword which is made fiery. (Hooker) fiery cross, a cross constructed of two firebrands, and pitched upon the point of a spear; formerly in Scotland borne by a runner as a signal for the clan to take up arms.
Origin: Formerly written firy, fr. Fire.