'firebug' definitions:

Definition of 'firebug'

From: WordNet
noun
A criminal who illegally sets fire to property [syn: arsonist, incendiary, firebug]
noun
A true bug: brightly colored bug that can exude a stain

Definition of 'firebug'

From: GCIDE
  • firebug \firebug\ n. a criminal who illegaly sets fire to property; an arsonist.
  • Syn: arsonist, incendiary. [WordNet 1.5]
  • 2. a brightly colored type of true bug that can exude a stain. [WordNet 1.5]