wild·fire /-ˌfaɪr/
  古時攻打敵船所用的燃料劑,燐火,鬼火
  Wild·fire 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. Med. (a) An old name for erysipelas.  (b) A disease of sheep, attended with inflammation of the skin.
  3. A sort of lightning unaccompanied by thunder.  [R.]
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  wildfire
       n : a raging and rapidly spreading conflagration