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: Webster's Revised Unabridged Dictionary (1913)