re·frac·tive \-ktiv, -ktēv also -ktəv\adjective 1.: having power to refract < refractive lens > 2.: relating to or due to refraction < refractive phenomena > < refractive dispersion of light > • re·frac·tive·ly\-tə̇vlē, -li\adverb • re·frac·tive·ness\-tivnəs, -tēv- also -təv-\noun-es