Source : Webster's Revised Unabridged Dictionary (1913)

Pyrotechnics \Pyr`o*tech"nics\, n.
   The art of making fireworks; the manufacture and use of
   fireworks; pyrotechny.

Source : WordNet®

pyrotechnics
     n 1: (music) brilliance of display (as in the performance of
          music)
     2: the craft of making fireworks [syn: {pyrotechny}]