The Collaborative International Dictionary of English v.0.48:

Pyrotechnics \Pyr`o*tech"nics\, n.
   The art of making fireworks; the manufacture and use of
   fireworks; pyrotechny.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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