Source : Webster's Revised Unabridged Dictionary (1913)

Firebrand \Fire"brand`\, n.
   1. A piece of burning wood. --L'Estrange.

   2. One who inflames factions, or causes contention and
      mischief; an incendiary. --Bacon.

Source : WordNet®

firebrand
     n 1: a piece of wood that has been burned or is burning [syn: {brand}]
     2: someone who deliberately foments trouble; "she was the
        instigator of their quarrel" [syn: {instigator}, {provoker},
         {inciter}, {instigant}]