The Collaborative International Dictionary of English v.0.48:
Burster \Burst"er\ (b[^u]rst"[~e]r), n. One that bursts. [1913 Webster]WordNet (r) 3.0 (2006):
burster n 1: a quantity of explosive to be set off at one time; "this cartridge has a powder charge of 50 grains" [syn: charge, burster, bursting charge, explosive charge]