The Collaborative International Dictionary of English v.0.48:
Pyrotechny \Pyr`o*tech`ny\, n. [Cf. F. pyrotechnie.] 1. The use and application of fire in science and the arts. [Obs.] --Sir M. Hale. [1913 Webster] 2. Same as Pyrotechnics. [1913 Webster]WordNet (r) 3.0 (2006):
pyrotechny n 1: the craft of making fireworks [syn: pyrotechnics, pyrotechny]