Wildfire

Part of speech: noun (n.)

1. A composition of inflammable materials, which, kindled, is very hard to quench; Greek fire. Brimstone, pitch, wildfire . . . burn cruelly, and hard to quench. Bacon.

2. An old name for erysipelas.

3. A disease of sheep, attended with inflammation of the skin.

4. A sort of lightning unaccompanied by thunder. [R.]