lighted up by or as by fire or flame; "forests set ablaze
(or afire) by lightning"; "even the car's tires were aflame"; "a night aflare with fireworks"; "candles alight on the tables"; "houses on fire" Synonym(s):ablaze(p), afire(p), aflame(p), aflare(p), alight(p), on fire(p)
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Afire \A*fire"\, adv. & a. [Pref. a- + fire.]
On fire.