An artificial firework consisting of a cylindrical case of
   paper or metal filled with a composition of combustible ingredients, as
   niter, charcoal, and sulphur, and fastened to a guiding stick. The
   rocket is projected through the air by the force arising from the
   expansion of the gases liberated by combustion of the composition.
   Rockets are used as projectiles for various purposes, for signals, and
   also for pyrotechnic display.