Definition of: wildfire

(wīld′fir′) noun
1. A raging, destructive fire: now generally in phrases like to spread like wildfire.
2. A composition of inflammable materials, or the flame produced by it, very hard to put out; Greek fire.
3. A phosphorescent luminousness; ignis fatuus.
4. Obs. A spreading inflammation of the skin; erysipelas.
5. A skin disease of sheep with inflammation.