Source : Webster's Revised Unabridged Dictionary (1913)

Pyrotechnic \Pyr`o*tech"nic\, Pyrotechnical \Pyr`o*tech"nic*al\,
   a. [Pyro- + technic, technical: cf. F. pyrotechnique. See
   {Fire}, {Technical}.]
   Of or pertaining to fireworks, or the art of forming them.

   {Pyrotechnical sponge}. See under {Sponge}.

Source : WordNet®

pyrotechnical
     adj : of or relating to the craft of making fireworks;
           "pyrotechnic smokes" [syn: {pyrotechnic}]