Source : Webster's Revised Unabridged Dictionary (1913)

Ignitor \Ig*nit"or\, n.
   One who, or that which, produces ignition; especially, a
   contrivance for igniting the powder in a torpedo or the like.
   [Written also {igniter}.]

Source : WordNet®

ignitor
     n 1: a substance used to ignite or kindle a fire [syn: {igniter},
           {lighter}]
     2: a device for lighting or igniting fuel or charges or fires;
        "do you have a light?" [syn: {lighter}, {light}, {igniter}]