Source : Webster's Revised Unabridged Dictionary (1913)

Burster \Burst"er\ (b[^u]rst"[~e]r), n.
   One that bursts.

Source : WordNet®

burster
     n : a quantity of explosive to be set off at one time; "this
         cartridge has a powder charge of 50 grains" [syn: {charge},
          {bursting charge}, {explosive charge}]