The Collaborative International Dictionary of English v.0.48:
Deflective \De*flect"ive\, a. Causing deflection. [1913 Webster] Deflective forces, forces that cause a body to deviate from its course. [1913 Webster]WordNet (r) 3.0 (2006):
deflective adj 1: capable of changing the direction (of a light or sound wave) [syn: deflective, refractive]